Merge branch 'glow_effects'

Merge branch 'glow_effects'
Several enhancements to make dark levels more viable by adding a glow to several objects.  Candles have additional functionality to allow for many custom ambient lighting effects.  An ice vulnerability is also added to flame badguys; in addition, a fire vulnerable and invulnerable version of flame is added.  Finally a spiky-like badguy, LiveFire, is added which offers a sleeping and dormant (does not wake) state as well.  The effects can be observed in the added test level: "Glow Effects Test".

TODO: LiveFire graphics, regular level(s) intoducing the effects, and the addition of new sprites for candles would be nice.