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/video_core/video_core.cpp

@@ -9,8 +9,6 @@
 
 namespace VideoCore {
 
-std::atomic<bool> g_toggle_framelimit_enabled;
-
 std::unique_ptr<RendererBase> CreateRenderer(EmuWindow& emu_window) {
     return std::make_unique<RendererOpenGL>(emu_window);
 }