reorganised the ability scripts
Changed Glide to fit into the Buff type. Other abilties can use the GravitySet script to do fun stuff with gravity
Changed GravitySet to GravityReduce as this makes more sense for how the ability should behave as an upgrade. Also made it so that GravityReduce can be applied to multiple targets and undone correctly
Tweaked jumping so make it more consistent. Now you can only jump once per button press and your jump height should always be the same (unless the jump button is held down)
Finished Dash upgrade paths. All current abilities can now upgrade all other abilities
Added a capacity spawner prefab
beefed up the arena a bit
added a gizmos draw to spawners to visualise their spawn radius