Revert "key events: Apply modified keypressrelease patch"

This reverts commit 19eed0dcebd99c5c46a33a239e6013fa4c4c5795.

Conflicts:
	config.def.h
Revert "focusstack: Do not allow focus to drift from fullscreen windows"

This reverts commit 4b168074c694e2d7fe901be45e6a8148a2aa1751.
make config: Do not warn about unused functions