[port] Port to Qt5/QtQuick2 + disables clipboard support

I based off the porting work by @special and fixed few crashes and bugs.

Fingerterm is finally usable as it shows properly on device (no half-clipped keyboard)

I had to disable clipboard support as it's not working very well in qtwayland at the moment, and it would lead to crashes when opening the menu.

TODO: gestures/select/scroll modes are currently only working if performed in the keyboard area, when the vkb is set to "off"