Allow clearing all scheduled events using Game::clearSchedule
Fix vector assignment in terrain.frag

Apparently some drivers are picky about this.

Fixes #1449
Merge pull request #1450 from rgngl/patch-1

Fix vector assignment in terrain.frag
Merge pull request #1451 from blackberry/master

Merge master to next
Merge pull request #1444 from rlofc/next

Allow clearing all scheduled events using Game::clearSchedule