New Features:
* Options for EXTREME and ULTIMATE terrain detail levels for screen shots and power users.
* Added right click (left trigger or X on controller) to go backwards through a list in the options menu.
Fixes:
* Fix lower level of detail meshes not showing user changes. Level of detail chunks with changes may take a while to regenerate.
* Fix F12 not taking screen shots on Steam client.
* Fix block-lighting updates on chunk deltas for Steam client.
* Fix emulated mouse with xbox-pad stopping when stick is not moving even if not at rest state.
* Fix new chunks not loading when switching terrain detail.
* Improve performance of block lighting for eg, lava oceans.
* Fix fogging of sky/sun in reflections causing sky/sun to be always be clearly visible.
* Fix cracks in geometry at y = 256 on chunk borders for both web and Steam client.
* Fix physics issue (falling through floor with prediction errors) at y = 256 on floating platforms.
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