Updated list of global configs

Changes:
* added `modalEscapeKey`
* added `secondsBetweenRepeat`
* added `snapshotMacStackSize`
* added `undoMaxStackSize`
* added `undoOps`
* removed `switchType`
* added `windowHintsIgnoreHiddenWindows`
* removed `windowHintsIconAlpha`
* removed `windowHintsRoundedCornerSize`

Source https://github.com/jigish/slate/wiki/Global-Configs