Some bugfixes, and minor feature updates

[Razzeeyy]

Hello! Thank you for saving me the time of prototyping quake movement in unity. Here is my little payback.

I updated the JS script to drop use of obsolete APIs (made compatible with Unity 2018).

Also in both C# and JS scripts:

• I fixed the overaccel over Z axis (forwards/backwards) in midair. Although I'd appreciate testing if that bug ever occured for anyone else but me. To reproduce simply jump and hold forwards and watch yourself fly breeze through the air at ~40 ups (while MaxSpeed is just 7 and we're not even strafin).
• Top Velocity stat display used to display wrong value because it was also adding the Y axis (up/down) into calculations, which is not what we interested in most likely.
• Implemented holdToJump option toggle, just a quality of life for some filthy casuals like me, who get bored to time the jumps even with queueing 😄

Csharp script tries to use Camera.main as playerView if the latter is null when script Start.

I appreciate any edits/feedback and etc.

Thanks!

[WiggleWizard]

I love seeing the community giving back, many thanks and appreciations! I hope others benefit from this too.