Alpha 2 - minor QoL changes and updates

A new update with some QoL changes and response to feedback received via Discord.

Complete changelog:

feat(ui): crosshair rotates when changing loadouts
feat(ui): crosshair and sound effect when damaging an enemy (hitmarker)
feat(ui): tooltip system
feat(ui): screen and sound effect when taking damage
fix(player): aerial movement was sluggish
fix(weapons): explosions don't proc multiple times anymore against targets with multiple hitboxes
fix(vanguard): the detonate ability now resets the rocket launcher's cooldown properly
fix(vanguard): the frontal shield now works again
fix(player): weapons don't get clipped into the wall anymore
change(ui): ability cooldowns are easier to see
change(ui): ability buttons are now visible when configuring loadouts
change(level): conveyor belts are now larger
change(vanguard): the charge ability was massively modified/buffed - it's now omnidirectional and stops all player momentum while charging (including gravity lmao)
change(ninja): grappling hook's cooldown increased when the hook misses
asset(level): glass breaking sfx
asset(ui): ability slot sfx
asset(level): health pickup sfx
asset(ui): hitmarker sfx
asset(ui): damage taken sfx
asset(ui): crosshair sprite