* Relax assumptions about when Lua is called in foreground and background
* Start Lua cycle timer both in foreground and background
Do not assume that background/foreground alternates
* Lua is called at every Standalone GUI cycle instead of 5 Hz
Since Lua preempts every 50 ms or so, the GUI should remain responsive.
* In standalone script, only call Lua once per GUI cycle, to avoid messing up buffer handling.
* Revamped error reporting for Standalone and Telemetry Lua scripts
* Font size for Lua error is reduced from XL to L on color if LCD_W < LCD_H
* In drawTextLines, also possible linebreaks for opening brackets.
* Smaller font for error message on tall color screen
* Make titlebar height match font size on narrow LCD
* Issue #132
Added 16 shared memory variables which can be accessed bot from Lua widgets and other Lua scripts.
* Notice Only available on radios with color display
* Preliminary trims as keys for lua
Largely based on open-flysky implementation
* Add `isLuaStandaloneRunning()`
* Add more virtual events
* Tweak virtual events further
* Finish remapping keys to virtual events
* Move some virtuals to right trim hat
* Add missing "defined"
* Revert to common EVT_VIRTUAL_MENU mapping
* Make keys/trims reset backlight like other radios
* Fixed a bug where a standalone Lua script w/o a run function will hang the GUI on non-color radios
* Prevent Lua standalone window from opening if Lua failed on load
* Fixed scroll down key in TX12 simulator
Copied key definitions from TX16S
* Fixed the Lua error trying to call nil value when no scripts are loaded.
* I messed up in the previous commit; now it does not freeze and it does not call nil.
* Do not reload bitmps during theme update, unless reload argument is true
Trying to optimize speed for theme color changes.
FlySky is not optimized yet.
* Do not update theme from Lua lcd.setColor(CUSTOM_COLOR, x)
Some widgets like e.g. Timer2 constantly change CUSTOM_COLOR, and this seems to slow down things
* Lua function lcd.setColor() only updates if color is changed
To avoid that scripts calling lcd.setColor() repeatedly trash performance
LCD flags can now hold either a theme color index or a RGB value. Hence, values from lcd.RGB() and literal colors like e.g. RED, WHITE etc. can be used interchangeably with theme colors and CUSTOM_COLOR.
Also redesigned drawText, drawNumber and drawTimer, so they now use a common function to implement the party tricks with BLINK and INVERS flags.
I had deleted the default color, now it is back again. Lua drawPoint color did not work, it does now. Some style updates to the Lua code where several different names were used for variables holding flags.
The function luaResume(...) assumes that it is called alternatingly in the background and the foreground.
But on color LCD radios it is only called in the foreground by standalone and tools script, so it got stuck waiting for a foreground call.
Since Lua only runs at 10 Hz and the GUI at a higher frequency, events sometimes are skipped unless we store them in a buffer.
This buffer is only two slots, but can be expanded by changing EVENT_BUFFER_SIZE.
