Refactored ui-related code
[WIP] New game dialog with size selector added
Size-selector improved
Improved dialog buttons
More size selector improvements
Moved size selector into separate file
Only allow even number of cards to be selected
Added theme, width and height stage properties
Make the compatible with gtk 3.6 for Ubuntu
New game selection shown on restart
Dont loop infinitely if grid size is above number of images
Add further ideas for implementation