Tab and focus in GUIs with inputs

[rfox90]

Pressing tab or alt tabbing when a caret is in an input box often gets it stuck. You have to juggle focus to get back to an active caret and working box.

[alaa-eddine]

Focusing input using Tab/Alt Tab is not supported, I'll see if there is a possibility to implement it. Actually, since EZGUI is mainly targetting cross device games, I focus first in common features on both Desktop and mobiles. specific features (like Tab to change focus) will be added as soon as the common features are stable.