As per @daenyth’s comment:
https://github.com/Cockatrice/Cockatrice/pull/792#issuecomment-76593730

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

Removed resolved issues from TODO.md; fix #918

Remove old unused sets.xml related files
Remove faqs and shortcuts doc since they’re outdated and been rewritten
in the wiki

Ensure sounds are working at startup; Fix 1070

Reveal top x cards

Run oracle from inside cockatrice and improve sets handling; 

Add backward compatibility for new client on old servers

Cleanup

+ Removed todo
+ linked test sound to the player joined sound

Fix macro for MSVC; fix #1063

NSIS installer improvements; refs #876

Connected die roll dlg to parent

Die roll now has a logo as it is correctly connected to the parent.

Remove spaces and parenthesis from package names; hopefully fix #1063

 * uninstaller: delete zlib1.dll (first issue in #876)
 * require the user to uninstall the old version before installing the
new one
 * use project-version as branding name (fourth issue in #876)

Refreshing Cockatrice Sound

Updated reveal zone

Updated filter svgs

Updated hand and table color

Fixed revealing top card bug

Now uses the same as in the deck editor

+ added sound setting page
+ added sound setting icon
+ moved sound settings from interface settings

Added master volume

+ added master volume slider.
+ volume can be changed by sliding bar or by using the spin box
+ Preview of  volume will be played when dragging and releasing bar.

Added checks for qt4

Qt4 does not have support for setting the volume without some lengthy
work around, I have disabled volume control for qt4 users and have
mentioned that "Master volume requires qt5".

Updated sfx

+ removed all old sfx
+ added new end step and tap sound
+ tap/endstep sound has a timer on it to prevent spamming
+ test sound engine will now use endstep sound

Made end step sfx softer

end step felt too harsh

Added player joined sound

+ added a sound for when a new player joins a room

Updated

Was missing a sound when a player joins

Made end step softer

Made end step even softer

updated sound again

Updated default colors, darker, more modern, slick. Great feedback from
community.

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

Moved zone loactions

Updated reveal zone check boxes