[GActs] Qt5 compatibility.
[HttHare] Qt5 compatibility.
[Imgaste] Qt5 compatibility.
[Util] Qt5 compatibility for X11 library.
[KBSwitch] Qt5-compatible QML stuff.
[KBSwitch] At least it builds with Qt5 now.

Doesn't receive state notify events though yet.
[KBSwitch] Proper consts usage.