video_core; Get rid of global g_toggle_framelimit_enabled variable

Instead, we make a struct for renderer settings and allow the renderer
to update all of these settings, getting rid of the need for
global-scoped variables.

This also uncovered a few indirect inclusions for certain headers, which
this commit also fixes.

src/core/hle/service/nvflinger/buffer_queue.h

@@ -6,6 +6,7 @@
 
 #include <vector>
 #include <boost/optional.hpp>
+#include "common/common_funcs.h"
 #include "common/math_util.h"
 #include "common/swap.h"
 #include "core/hle/kernel/event.h"