Fixes for player being unable to boost/walljump on map change.
Boosting and walljumps have separate cooldowns now, so you can still jump right after finishing a boost.
Spreadguns dropped by enemies will also drop some spare ammo.
Fix health numbers not being rendered when invulnerable.
Fix Invinciball not displaying the invulnerable healthbar.
Fix a targetter crash due to an incorrectly written conditional check.
Attempt to reduce the lag caused by excess damage numbers.
