Prevent Lua from allocating all heap memory (Horus) (#4440)

* 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

radio/src/main_arm.cpp

@@ -138,6 +138,9 @@ void periodicTick_1s()
 void periodicTick_10s()
 {
   checkBatteryAlarms();
+#if defined(LUA)
+  checkLuaMemoryUsage();
+#endif
 }
 
 void periodicTick()