Melee Fixes

Fixes bugs with the shovel, kitchen knife, and shotgun:

• Fixed shovel sometimes becoming unusable if a player died while holding it mid-swing.
• Fixed hit effects (shovel bounce, knife blood spray) sometimes playing even if your swing misses, providing poor feedback.
• Whenever a melee weapon plays a hit sound, it calls an expensive search function that can cause lag or frame drops on less powerful computers.
  • It now references a cached instance of the required object, which should help combat remain more smooth and fluid.
• Damage should now be handled more consistently when firing the shotgun at multiple enemies
• Fixed duration of ear-ringing effect when a shotgun is shot in point-blank range (usually, because you are the one holding it)