fixed music player image button mouse over highlight
Merge pull request #4830 from Mailaender/music-button-mouseover

Fixed music player image button mouse over highlight
Make Allied and Soviet factions build general-purpose mines instead of AT and AP mines.
Update CHANGELOG for mine changes
Overhaul ingame timer displays. Fixes #3062.
Remove World.FrameNumber.
Fix Sound coding style nits.
Merge pull request #4852 from pchote/timer-fixup

Overhaul ingame timer displays.
Merge pull request #4827 from ScottNZ/balance

Make Allied/Soviet factions use general-purpose mines
moved internal time step setting to Game

player should not be able change it as it is not synced yet
add a pause/slowdown/play/fastforward button for replays

closes #4633
separate World and Ui LastTickTime
use relative tick time intervals
keep the catch up for small delays and truncate larger ones