Add Better Control For Space Elevator

[ghost]

This PR aim to make space elevator's control feel better, with some formatting changes

• Rework the function PlayerOnLiftMovement(), the function changes player.kv.airAcceleration and player.kv.airSpeed instead of using script to modify player's velocity( which cap to 10tick and feels bad with latency )
• Change all 0.935 number to use a const SPACEELEVATOR_TUNING_TOP_FRAC
• Add 3 utility functions:
  • bool functioin PlayerNotDoingInput( entity player )
  • vector function GetPlayerVelocityFromInput( entity player, float speed )
  • vector function RemoveVelocityHorizonal( vector vel )

EDIT: I have a space elevator script for titanfall2 in https://github.com/DBmaoha/Super.Mixed.Game/blob/main/mod/scripts/vscripts/modweapons/mp_ability_gravity_lift.gnut , but it's not very similar as this one. I can try to implement some more changes from my script in future pr if you are interested!

[CafeFPS]

I tried it and I couldn't hover on top trigger like my implementation, can you check that?