Rename FrameProcessor to VideoFrameProcessor, and GlEffectsFrameProcessor to DefaultVideoFrameProcessor. Most changes are semi-mechanical, semi-manual find-replace, preserving case: * "FrameProc" -> "VideoFrameProc" (ex. FrameProcessor -> VideoFrameProcessor, and FrameProcessingException -> VideoFrameProcessingException) * "GlEffectsVideoFrameProc" -> "DefaultVideoFrameProc" PiperOrigin-RevId: 509887384
