hard oracle doesnt remove bullets on death
tweaked some trench hard powerups
tweaked orb hard core0 powerup
tweaked nightmare onion powerup
less shield powerups on hard octopus
Merge branch 'master' of SpaceUsurperUnity
added sfx for orb grid pattern
dont play AllPrereqsDestroyed sfx more than once at a time
some laser stage sfx stuff
fixed invasion warp sfx volume issue