Projectkk2glider/lua bitmap free (#4075)

* 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)

radio/src/gui/212x64/model_custom_scripts.cpp

@@ -118,7 +118,7 @@ void menuModelCustomScriptOne(event_t event)
 
 void menuModelCustomScripts(event_t event)
 {
-  lcdDrawNumber(19*FW, 0, luaGetMemUsed(), RIGHT);
+  lcdDrawNumber(19*FW, 0, luaGetMemUsed(lsScripts), RIGHT);
   lcdDrawText(19*FW+1, 0, STR_BYTES);
 
   MENU(STR_MENUCUSTOMSCRIPTS, menuTabModel, MENU_MODEL_CUSTOM_SCRIPTS, MAX_SCRIPTS, { NAVIGATION_LINE_BY_LINE|3/*repeated*/ });