that f6b2066ff3 gui: keyboard: support longpress label offset, code cleanup ...

To position the longpress label:
<longpress font="..." textcolor="..." x="5" y="0"/>
x and y is the distance from the upper right corner.

- extract method GUIKeyboard::DrawKey
- clean up handling of currently pressed key
- integrate key highlighting into main key drawing loops

Change-Id: I80ccf2975d30cffa2a48627a74ab3693c84e4fa4

2015-07-14 16:00:35 +02:00

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