* [simulator] Keyboard and mouse control adjustments:
~ Make kay/mouse navigation more consistent between radios and ensure keyboard events are always properly detected (eg. after clicking on a control);
* Fix mouse wheel direction for rotary encoder emulation (fixes https://github.com/opentx/opentx/issues/4160);
* Fix page up/down buttons on Horus (also #4160);
~ Horus rotary encoder can now be controlled with +/- keys (also keeps X/C, otherwise supersedes https://github.com/opentx/opentx/pull/4087 );
~ DEL key now another alternative for ESC/BKSP (brings all controls to number pad);
~ "=" key now acts same as "+" key (+ requires SHIFT in main row on most US keyboards);
* Fix controls direction when using mouse wheel over RC switches;
+ Add help text showing keyboard mappings for each radio type (activate on F1 key).
* [simulator] Enable mouse wheel scrolling on radios w/out a rotary encoder (acts as +/- keys on X9D, PU/DN keys on 9X).
* [simulator] Save and restore Simulator window sizes and positions (based on current radio profile).
* [simulator] Set startup throttle stick lock in standalone sim based on default mode in current Companion radio profile;
Add new flag indicating standalone simulator;
Unique titles for simulator console windows.
* [simulator] New/updated Simulator startup options:
Radio profile used for standalone Simulator can now be separate from Companion;
Allow selecting a radio profile and EEPROM image file (in addition to radio type) at startup via GUI and CLI;
All startup settings are saved between uses.
* [simu] Reduce width of all simulator windows and also height of Horus window. (https://github.com/opentx/opentx/issues/3135)
* [simu] New vertical channel outputs layout for all simulators, all outputs in one window and horizontally scrollable. Consolidate outputs and gvars widgets to one code base for all sims. Make simulator dialog re-sizable.
* [simu] Make simulation dialog resizable, and greatly reduce minimum size requirements of all simulators. Introduces new VirtualJoystickWidget class with all controls. Simplifies every simulator dialog UI form.
* Fix for issue with trackpad & mouse wheel: Small movements up or down send delta=0, causing always events in the same direction.
* Changed keys to X,C
Introduced the term Radio Backup File to describe the eprom files that are uploaded from the radio.
The terms Radio, Tx and TX were used intermittently. I changed them all to Radio (naturally not in contexts having anything with the actual radio transmitting circuit).
