Small bugfixes.
- Empty textboxes now display cursors
- get_label_image_pos() was re-written -- it now takes sensible parameters,
and uses font_height() instead of the height of rendered SDL_Surfaces
- This allows empty textboxes to have cursors, even though they do not
have rendered SDL_Surfaces
- When a character only partially visible is selected in a textbox, the
textbox scrolls so that this character is fully visible
- xuni no longer crashes with libfreetype6 2.3.5-1+b1 with font point size 1
(the smallest possible point size has been made 2)
- Images are now rotated and then rescaled
- Scrollbar buttons look much better now
- Listboxes now clip very well (though it remains a temporary solution)