[MOD] Multiplayer v2

I made another update to the multiplayer port! Here are the changes:

• Respawn time is now 3 seconds instead of 15
• Added a cursor
• Doors now sync states
• Fixed the bucket mesh
• Fixed the conveyer belt mesh
• Switched out the hologram player for a basic capsule
• Added player usernames
• Fixed clients only being able to join in survival, now if joining a creative world the client will be in creative mode
• Increased the maximum amount of items in the game at once from 9999 to 999999 (don't actually... spawn this many in)
• Small islands should now spawn
• Resources should now regenerate
• Incinerators should now destroy pickaxes
• Fixed a lot of networking sync issues for destroying objects
• Apples just fly off trees now. It was the easiest way I could fix the bug of everything not working
• Fixed the world's resources sometimes not loading in for clients
• Fixed achievements not displaying in the achievement menu
• Redid the intro to better fit the game
• You can now pick up objects placed or dropped by other players