[Simulator] Add ability to update .otx files. (#4422)

* [SimulatorInterface] Add ability to read eeprom data back from simulator instance.

* [Simulator] If started with .otx file, Simulator will now update (or create) the file upon exit using current radio/model data; Consolidate internal startup and shutdown code for handling various data sources.

companion/src/simulation/simulatorinterface.h

@@ -62,7 +62,7 @@ class SimulatorInterface
 
     virtual ~SimulatorInterface() {}
 
-    virtual void setSdPath(const QString & sdPath = "", const QString & settingsPath = "") { };
+    virtual void setSdPath(const QString & sdPath = "", const QString & settingsPath = "") { }
 
     virtual void setVolumeGain(int value) { }
 
@@ -72,6 +72,8 @@ class SimulatorInterface
 
     virtual void stop() = 0;
 
+    virtual void readEepromData(QByteArray & dest) = 0;
+
     virtual bool timer10ms() = 0;
 
     virtual uint8_t * getLcd() = 0;