Update R4

Added and updated a bunch of game feel stuff.

• Adds acceleration based player movement, you can even bhop now.
• Adds weapon spread and recoil when moving and shooting.
• Adds view punch when shooting quickly.
• Adds WIP bullet impact effect, for now just to help visualize how recoil works.
• Adds directional indicators when taking damage.
• Adds footstep and landing sound effects.
• Adds sound effects for shell casing impacts.
• Increases volume of death and pain sounds for enemies.
• Reworks mouse input.
• Fixes an issue where jump height was wildly inconsistent.
• Fixes an issue where you could shoot instantly after starting a reload.
• Increases the size of enemies somewhat.