Missing text entry widget

[Rafał Cieślak]

Sometimes, the user may want to type in some text.
That includes server IP, player nickname, etc.

That is of course work for a new widget.
Implementing this feature also requires adding key-press reactions to the main loop, and passing them down recursively into the currently focused drawable.

That means such entry widget should react on clicks, and when clicked, it should mark itself and its parents (recursively) as 'focused', so that keypresses are passed down to it the right way.

Of course methods such as setting/getting text, making the entry sensitive/insensitive for input, etc. are needed.

[Rafał Cieślak (rafalcieslak256)]

I have implemented a basic WEntry, which reacts on keypresses.
There is still room for improvements though, including cursor display and movement with arrow keys.