FITIn: adds missing lua_openbase to lua_init
FITIn: adds security check and spec fix for Lua's fprintf
FITIn: adds many missing comments to Lua bridge
FITIn: adds Lua-callback check, cleans code
FITIn: changes Lua a little to work with missing %f format
FITIn: adds many Lua packages to embedded mode
FITIn: adds "monitor_address" and "treat_superblock" callbacks
FITIn: adds "before_start" and "after_end" callbacks
FITIn: adds "next block" and stop-runtime function