added mine limit convar sv_simfphys_maxmines

- [changed] damage filter method reduced from 500 bullet damage to 100 + fixed logic error not allowing you to deal less than 500 damage before registering.

I honestly don't know if this is better or not but since everyone just complained i had to do this

- removed unnecessary file downloads

*** THIS UPDATE MOVED THIS ADDON TO THE NEW WORKSHOP FORMAT ***

- [fixed] airboat gun lua error

tweaked leopard air drag for x86 x64 branch / upcoming gmod update

- [added] bind detection for tank turret activation button
- [changed] sherman topspeed
- [changed] physprojectile ricochet behaviour + angle calculation code
- [changed] lowered bullet hit-sound soundlevel
- [fixed] physprojectile filter-table spam

- [fixed] Hud can now be hidden using the ShowHud setting inside the client settings menu
- [fixed] lua error when a tank was removed at the same tick it was firing the main cannon

- [changed] HUD speed display no longer limited to worldsize kmh
- [changed] nerfed jeep gauss cannon
- [changed] Combine APC now has passenger seats
- [fixed] mines not having an CPPI prop-protector owner

- [fixed] projectile turret not having an attacker