Add a controllable character

[simplerr]

Try using Half-Life physics from https://github.com/Matherunner/strafelib.

https://www.reddit.com/r/Unity3D/comments/7w97nq/porting_hl_movement_to_unity3d_surf_and_bhop/ https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/game/shared/gamemovement.cpp https://www.reddit.com/r/Unity3D/comments/dcmvf5/i_replicated_the_source_engines_air_strafing/ https://web.archive.org/web/20190428135531/http://www.funender.com/quake/articles/strafing_theory.html https://www.jwchong.com/hl/strafing.html http://adrianb.io/2015/02/14/bunnyhop.html https://steamcommunity.com/sharedfiles/filedetails/?id=184184420

• [x] Dummy character controller
• [x] HalfLife movement
• [x] Hide cursor when in FPS mode
• [x] Draw viewmodel
• [x] Crosshair
• [ ] Capture collisions between player and actors
• [x] Show current and highest speed
• [x] Show dotted line with path