+ 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
