Fix font display in stereoscopic modes CGUIFontTTFGL::LastEnd was previously using the relatively high-level CGraphicContext::SetScissors function to enforce hardware clipping. However, the coordinates it passed in already contained the stereoscopic offset, so the CGraphicContext::SetScissors effectively ended up double-applying the offset, with the effect that clip rectangles were always off-screen. Changed to call the low-level SetScissors call instead (using g_Windowing to select the correct implementation, e.g. CRenderSystemGLES::SetScissors). This also skips the intersection of the scissors with the screen limits, but that does not appear to matter in practice.
[omxplayer] Remove unused framerate functions
[rpi] Include ntsc frequencies in list of supported resolutions
[omxplayer] Allow a framerate callback from GPU to trigger a hdmi mode change
[omxplayer] Add ability to log more timestamp info in extra debug settings
settings: Potential fix for hang when changing language