Changes

Added a setFPS() method to GuiVideoFramerateSlider to programmatically change the FPS value

Added methods to RenderOptions to save/load a RenderOptions object from/to a Forge Configuration instance
Set default bitrate String to "10000K" instead of "10M", which is the same value but is simpler to parse for me
Set default of hideNameTags to false as it is in the GuiRenderSettings

The GuiRenderSettings loads their initial settings from the Replay Mod config
Upon rendering, the GuiRenderSettings saves the current RenderOptions to the Replay Mod config