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/lua/widgets.cpp

@@ -519,6 +519,7 @@ void luaInitThemesAndWidgets()
       // if we got panic during registration
       // we disable Lua for this session
       // luaDisable();
+      luaClose(&lsWidgets);
       lsWidgets = 0;
     }
     UNPROTECT_LUA();