0.3.1.6 Beta Release

Skipped 0.3.1.5 as I consider WombatFromHell's fork version 0.3.1.5 given its changes. These changes are now integrated here.

[WFH] WombatFromHell
[N1] Nielk1

[WFH] Major performance optimizations
[WFH] Decoupled render loop and controller update, changed threading/timing mechanism
[WFH] Gyro drift compensation via zero-motion auto-calibration
[WFH] Auto select first controller
[N1] Adjusted device list to show icons for connection type, still looking for method to find controller names
[N1] Adjusted automatic controller selection
[N1] Controller chimes on selection
[N1] Refactored and extended theme system, now cleaner with theme names
[N1] Theme list and author links shown in about dialog
[N1] Added "Silly" template to "Default" theme to demonstrate more unusual theming
[N1] Integrated and updated ExistentialEgg's themes
[N1] Integrated and updated 8BitCerberus's themes

Experimented with Linux support but was unsuccessful.