QoL improvements and bug fixes

[Demo748]

I came across this mod out of curiosity and for a bit of fun have been updating it with some quality of life changes, mostly making ground movement speed operate with vanilla behaviour and fixing some bugs

I've updated the readme to mention the below changes:

• Added config to toggle fall damage and stamina drain. Fall damage implementation could use work, but it functions similarly to vanilla
• Added separate config for walking speed, and changed the default movevar for sprinting speed to match vanilla sprint speed
• Added alternate chat commands to toggle autohop
• Added in vanilla behaviour for ground movement speed when carrying items, crouching, and limping
• Changed scrollhop to only jump with mwheeldown (when autohop is disabled), mwheelup is the default hotbar scrolling
• Fixed client and server side jump and landing audio not playing
• Fixed scrollwheel not working in the terminal/store
• Fixed pressing spacebar in chat/terminal queuing a jump when exiting

Issues I found that I didn't get to fixing:

• Opening chat freezes the player entirely, keeping them suspended in midair
• All inclined slopes are climbable by jumping, you can just bhop up an incredibly steep hill
• There's a sliding/falling/friction issue when walking on downhill slopes, likely the player is not on the ground the entire time so movement changes between WalkMove and AirMove rapidly, and you can't accelerate or travel in the direction you're facing well. A good example you see of this is up on the rock after taking the ladder towards the fire escape on Assurance.