Change default/startup preset.

projectM as shipped always starts on the same preset, which features the
projectM logo.  In addition to being boringly repetetive, we'd prefer
not to flash the projectM logo.

Replace the projectM "idle" preset with the contents of "Rovastar & Fvese -
Stranger Minds.milk", which I particularly like.

Disable the on-disk projectM logo preset as well.

On startup, if we're in shuffle mode, pick a starting preset at random.

Change-Id: I013539cdc1b0f374b27452137348607895e377bd
3 files changed