Added WheelItemBase:IsLoaded lua function and associated error.
Added Swap Up/Down option to Edit Alter Menu.
Added Arbitrary Remap option to Alter Menu in Edit Mode.
Added FastNoteRendering preference.
Implement ScreenCaution, fix CDTitle
Merge branch 'changes-beta4' of https://github.com/Midiman/stepmania
Merge branch 'master' of https://github.com/stepmania/stepmania
add PIUIO_Leds driver

The mappings in this driver are specific to the piuio kernel driver, but
once lights mapping is possible this could be made into a generic leds
class driver.
don't set lights for nonexistent lights

duh.
point at the right file in the filesystem
Merge branch 'master' of https://github.com/stepmania/stepmania
Merge pull request #285 from kyzentun/ClearZPref

Added FastNoteRendering preference.
Merge pull request #277 from kyzentun/WheelItemIsLoaded

WheelItemBase:IsLoaded
Merge pull request #278 from kyzentun/EditSwapUD

Added Swap Up/Down option to Edit Alter Menu.
Localized Arbitrary Remap edit mode strings.  Changed track ids for Arbitrary Remap to start at 1.