This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

I saw in some images from other platforms it can take up alot of space.
Made the boxed horizontal, rather than vertical.

WIP Remade reveal zone

+ darkened card area to eaisily see boundries
+ reverted back to using a window
+ window can be resized
+ removed fake title bar and "X"
+ moved all cards revealed slightly to the right, makes it easier to
drag-select from the left

Cleanup

Changed style to use cockatrice icon

Changed cast

from static_cast to qstyleoption_cast

I saw in some images from other platforms it can take up alot of space.
Made the boxed horizontal, rather than vertical.

It doesn't make any sense to store that particular setting

when closing a view we save the current settings. I added a check to
only update the shuffle settings if the zone we are closing can be
shuffled.

Added a separator

+ added comments
+ refactored optimumRect

+ When viewing a sorted view (like revealing hand, or looking at
library), the cards will now be sorted in columns based on the main card
type.
+ Settings are now saved.

Revealing a library to a player now grants that player permission to drag cards out of that library onto his own table. This permission is revoked by shuffling the library. The zone view window tracks content changes of the zone for as long as the permission lasts so that card ID changes are kept track of. This hopefully fixes issues #5 and #12.