[Simulator] Asynchronous SimulatorInterface & a few new features. (#4738)

* [Simulator] Create RadioKeyWidget class for UI buttons & refactor ButtonsWidget; Refactor SimulatedUIWidget (and subtypes) to use new RadioKeyWidgets/ButtonsWidget; Centralize help text for key mappings and get creative with some icons; Simplify some radio UI setups with rectangular buttons.

* [Simulator] Convert all simulator data I/O to signals/slots mechanism:
    * SimulatorInterface/OpenTxSimulator:
       - Now inherits from QObject to allow signal/slot interface;
       - Allows data exchange on a per-item basis (eg. each I/O value is treated separately instead of sending whole arrays or structs of data);
       - Checks for data changes and only emits signals when change is detected (GUI can now assume only new values are being sent);
       - Manages its own 10ms timer (doesn't rely on GUI to do that);
       - Sends "heartbeat" signals @ 1Hz for status monitoring;
    * Simulator GUI:
       - All data is exchanged between GUI elements as well as SimulatorInterface via signals/slots using standardized methods;
       - Data is sent immediately, and only, when actually changed (eg. a control is moved) instead of in bulk at specific time intervals;
       - Similarly, an asynchronous method is used for reading incoming data, w/out timers or loops;
       - Improve VirtualJoystickWidget to be more encapsulated and configurable;
       - Pause telemetry simulator if window is hidden;

* [Simulator] Move SimulatorInterface instance to separate thread, ensure safe asynchronous operations & proper timer interactions; Protect/remove some functions, & reorganize the order (cosmetics).

* [Simulator] Traces are now delivered to OpenTxSimulator and one or more QIODevice(s) can be added as recipient(s); Add SimulatorInterface::getCapability() for compile-time settings; Remove reversed POT1/SLIDER1 mixer exception (Taranis) requirement for SIMU; Fix plus/minus key delay on wheel event w/out encoder.

* [Simulator] Add current knob/slider/trim input value in tool-tips (KnobWidget and SliderWidget).

* [Simulator] Fix trims widget internal value not properly updating, and remove trim influence on virtual joystick X/Y value display (closes #4671).

* [SimulatorInterface] Add handling of transmitter input voltage, including a rough conversion of volts to ADC value for different boards, and default battery volts lookup function; Clear analogs array before starting.

* [Simulator] Add SimulatorInterface::init() method to separate pre-startup tasks; Report actual trim range, not just extended on/off; Change how radio widget states are restored; VirtualJoystickWidget: Connect trim changes directly from simulator, connect joystick events directly, report stick mode directly instead of setting values/constraints externally.

* [Simulator] Calculate default Tx V input based on configured range in radio settings (or warning V+2 for radios which don't support a range).

* [Simulator] Add functional aux. trims for Horus (closes #4699).

* [Companion] Remove problematic QMessageLogContext from AppDebugMessageHandler::messageOutput().

* [Simulator] Prevent trim change via slider if disabled for flight mode (closes #4600).

* [OpenTxSimulator] Fixes for Qt < 5.4.

* [OpenTxSimulator] Fix slot name.

companion/src/simulation/simulateduiwidget.h

@@ -23,17 +23,18 @@
 
 #include "boards.h"
 #include "constants.h"
+#include "radiowidget.h"
 #include "simulator.h"
+#include "simulator_strings.h"
 
 #include <QWidget>
 #include <QMouseEvent>
 
 class SimulatorInterface;
 class LcdWidget;
+class RadioKeyWidget;
 class RadioUiAction;
 
-using namespace Simulator;
-
 /*
  * This is a base class for the main hardware-specific radio user interface, including LCD screen and navigation buttons/widgets.
  * It is responsible for hanlding all interactions with this part of the simulation (vs. common radio widgets like sticks/switches/knobs).
@@ -52,51 +53,51 @@ class SimulatedUIWidget : public QWidget
 
     ~SimulatedUIWidget();
 
-    RadioUiAction * addRadioUiAction(RadioUiAction * act);
-    RadioUiAction * addRadioUiAction(int index = -1, int key = 0, const QString &text = "", const QString &descript = "");
-    RadioUiAction * addRadioUiAction(int index, QList<int> keys, const QString &text = "", const QString &descript = "");
+    RadioWidget * addRadioWidget(RadioWidget * keyWidget);
+    RadioUiAction * addRadioAction(RadioUiAction * act);
 
-    QVector<keymapHelp_t> * getKeymapHelp()         { return &m_keymapHelp; }
-    QList<RadioUiAction *>  getActions()      const { return m_actions;   }
-    RadioUiAction *         getRotEncAction() const { return m_rotEncClickAction; }
+    QVector<Simulator::keymapHelp_t> getKeymapHelp() const;
 
-    QPolygon polyArc(int ctrX, int ctrY, int radius, int startAngle = 0, int endAngle = 360, int step = 10);
+    static QPolygon polyArc(int ctrX, int ctrY, int radius, int startAngle = 0, int endAngle = 360, int step = 10);
 
   public slots:
 
-    void updateUi();
     void captureScreenshot();
-    void simulatorWheelEvent(qint8 steps);
 
     void wheelEvent(QWheelEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
 
-  protected:
+  signals:
+
+    void controlValueChange(RadioWidget::RadioWidgetType type, int index, int value);
+    void customStyleRequest(const QString & style);
+    void simulatorWheelEvent(qint8 steps);
+
+  protected slots:
 
     void setLcd(LcdWidget * lcd);
     void connectScrollActions();
+    void onLcdChange(bool backlightEnable);
     virtual void setLightOn(bool enable) { }
 
+  protected:
+
     SimulatorInterface * m_simulator;
     QWidget * m_parent;
     LcdWidget * m_lcd;
     QVector<QColor> m_backlightColors;
-    QVector<keymapHelp_t> m_keymapHelp;
     QList<RadioUiAction *> m_actions;
+    QList<RadioWidget *> m_widgets;
     RadioUiAction * m_scrollUpAction;
     RadioUiAction * m_scrollDnAction;
-    RadioUiAction * m_rotEncClickAction;
+    RadioUiAction * m_mouseMidClickAction;
     RadioUiAction * m_screenshotAction;
     Board::Type m_board;
     unsigned int m_backLight;
-    bool m_lightOn;
     int m_beepShow;
     int m_beepVal;
 
-  signals:
-    void customStyleRequest(const QString & style);
-
 };