Finished the QTM library, Added some text in ctr.c

The QTM (Headtracking) is not tested on real hardware, and doesn't work in citra.
But should work, maybe. Please update your boot.3dsx to use it without errors.

source/ctr.c

@@ -13,6 +13,7 @@ void load_ir_lib(lua_State *L);
 void load_fs_lib(lua_State *L);
 void load_httpc_lib(lua_State *L);
 void load_qtm_lib(lua_State *L);
+//void load_cam_lib(lua_State *L);
 
 void unload_gfx_lib(lua_State *L);
 void unload_hid_lib(lua_State *L);
@@ -48,6 +49,7 @@ struct { char *name; void (*load)(lua_State *L); void (*unload)(lua_State *L); }
 	{ "fs",    load_fs_lib,    unload_fs_lib    },
 	{ "httpc", load_httpc_lib, unload_httpc_lib },
 	{ "qtm",   load_qtm_lib,   NULL             },
+//	{ "cam",   load_cam_lib,   NULL             },
 	{ NULL, NULL }
 };