Version 0.31 update

Update:

-Added bigger buff stacking with UI now showing the buff duration.

-Abilities that Buff Defense and Magic Defense should have a bigger effect now.

-Tweaked enemy sprites so they should be easier to select with mouse.

-Some enemies had no mana and couldn't use abilities, should be fixed.

-Fixed Ammo AI so it properly grants Volley Fire skill.

-Skills with a chance to inflict status effects had said chances reduced.

-Tank enemy now has a new sprite.

-Added some fluff descriptions around