* Fixes#4284: Prevent Lua from allocating all heap memory (Horus)
Lua bitmap functions cleanup and docs update
Added x or y < 0 check to drawBitmap()
* Proper float constant
* Better memory stats (CLI)
* Bitmap buffer overflow check added
* Lua bitmap improvements
* Proper handling of symbolic links in simulator
* S6R Lua script fixes:
* added progress screen while loading bitmaps
* memory for bitmaps is now freed when leaving the script
* S6R Lua script: improved bitmap loading
* * Lua Themes and Widgets moved to separate file and separate Lua state
* Stand-alone, mixer and function scripts now behave the same as on Taranis (restarted after the stand-alone script was run)
* both Lua states are independent: Themes and Widgets is initialized only at the start, the other one is initialized before and after the stand-alone script is run
* Better leak test and report in BitmapBuffer
* Re #3318: Lua compiler enabled in simu and Companion simulator. Usage:
* any time <xxx>.lua file is about to be loaded and if file <xxx>.lua.src exists:
* load contents of <xxx>.lua.src
* compile Lua code
* save compiled code into <xxx>.lua (effectively overwrites existing file)
* immediately following the compilation the real file loading is done from <xxx>.lua (which by now contains compiled Lua bytecode)
