Add cooldown option for noclip, improve code of noclip manager and respawn transforms

[spig95]

Changes

• Allow to specify a cooldown time in noclipOptions, during which the player cannot activate noclip
• Allow to specify an (approximated) duration for the respawn animation
• Add a noclip state in noclipmanager, which helps to understand what is going on. If we want to allow the player to always enable noclip, it should be pretty easy