Move music content to separate repo.
Removed old timer event classes
Merge branch 'develop' into soundtrack
Don't crash if assets can't be reloaded/disposed properly
Dispose streaming music assets correctly
Update FPS display only twice per second
Merge branch 'develop' into soundtrack
Fix audio end listener - rewind resets limit
Fix rare bug when playing the same music asset twice
Merge remote-tracking branch 'movingblocks/develop' into soundtrack

Conflicts:
	engine/src/main/java/org/terasology/rendering/world/WorldRendererLwjgl.java
Update versioneye plugin
Quick fix junit test that broke with #1366
Merge PR #1365 by @msteiger - version eye update
The run key toggles now between running and walking.
Run per default, as that is what you usually want.
Chranged the run key default from "Shift" to "R".
Moved wireframe mode from hotkey R to F9.

Reasoning R is a too well placed key to be used for that.
Made left shift toggle between running and walking while you hold it.

If the current default set with R is running, then holding left shift
will make you walk. If the current default set with R is walking
then holding left shift will make you run.
Made CAPS toggle running per default instead of R.
Update hotkeys and add a reflection cache clean task in Gradle