v1.60

Changes

• Added a handler for fall damage
• Added a cvar for jump height in HL2 mode
• Added the Toss & Bounce movetypes (untested!)
• Attempted to improve collision detection when using the point raytrace fallback
• Fixed being able to unduck into ceilings in HL2 mode
• Fixed ducking being way too slow in HL1 mode
• Fixed the player hull not changing when ducked in HL2 mode
• Fixed various issues when toggling between HL1 and HL2 mode