CLuaInstance: Move luainstance into a separate directory (src/gui/lua)

- Move video functions from luainstance.cpp to lua_video.cpp
 - For the future, provided the individual classes
   (eg menu, CComponents etc.) to move in separate files.

configure.ac

@@ -283,6 +283,7 @@ src/driver/Makefile
 src/gui/Makefile
 src/gui/bedit/Makefile
 src/gui/components/Makefile
+src/gui/lua/Makefile
 src/gui/widget/Makefile
 src/system/Makefile
 src/system/mtdutils/Makefile