Fix default end values for FlxRangeBounds and FlxPointRangeBounds
Remove redundant Null<T>s
Emit particles from their center
- Correctly apply autoUpdateHitbox (Rather than only when the scale has a range)
- Don't be wasteful with reset(). Only reset that which is true for every reset particle.
- Particles now emit from their center, not from their top left (like the old emitter)
- scaleRange was always "active" due to using "=" between points
Merge pull request #1196 from JoeCreates/ParticleFix

Lots of emitter fixes