(API Change) Remove obs_graphics()

API Removed:
- graphics_t obs_graphics();
Replaced With:
- void obs_enter_graphics();
- void obs_leave_graphics();

Description:
  obs_graphics() was somewhat of a pointless function.  The only time
that it was ever necessary was to pass it as a parameter to
gs_entercontext() followed by a subsequent gs_leavecontext() call after
that.  So, I felt that it made a bit more sense just to implement
obs_enter_graphics() and obs_leave_graphics() functions to do the exact
same thing without having to repeat that code.  There's really no need
to ever "hold" the graphics pointer, though I suppose that could change
in the future so having a similar function come back isn't out of the
question.

Still, this at least reduces the amount of unnecessary repeated code for
the time being.

plugins/win-capture/monitor-capture.c

@@ -92,12 +92,12 @@ static void monitor_capture_destroy(void *data)
 {
 	struct monitor_capture *capture = data;
 
-	gs_entercontext(obs_graphics());
+	obs_enter_graphics();
 
 	dc_capture_free(&capture->data);
 	effect_destroy(capture->opaque_effect);
 
-	gs_leavecontext();
+	obs_leave_graphics();
 
 	bfree(capture);
 }
@@ -130,9 +130,9 @@ static void monitor_capture_tick(void *data, float seconds)
 {
 	struct monitor_capture *capture = data;
 
-	gs_entercontext(obs_graphics());
+	obs_enter_graphics();
 	dc_capture_capture(&capture->data, NULL);
-	gs_leavecontext();
+	obs_leave_graphics();
 
 	UNUSED_PARAMETER(seconds);
 }