-Fixed the iOS ViewController to set the correct irregular
patch approximation mode.
-Fixed the setting of fractionalSpacing to be separate from
screenspace tessellation.
-Fixed the configuration of the internal stage-in setting
on embedded builds.
Updated the mtlViewer to make use of common/argOptions.h
like the other viewers and also implemented a "fit to frame"
hotkey. Both changes help improve manual testing.
Updated the Metal viewer runtime options to more
closely match the other viewers:
- default to adaptive tessellation
- default to patch type coloring
- present end cap options as: Linear/Regular/Gregory
- exposed switches for patch refinement options:
smooth corner, single crease, inf sharp
- updated fvar linear interpolation labels
and methods to match glFVarViewer
- updated iOS Main.storyboard GUI to match
