Overhaul ingame timer displays.

Removes the hard-coded timer widget, fixes the timer ticking when the game is paused (#3062), and adds playback speed labels for #4233.

![timers](https://f.cloud.github.com/assets/167819/2392340/5425b9d6-a976-11e3-9861-e9d2d40aaec8.png)