Fixed incorrect convar names being used in menu sliders

Minor optimizations
Fixed CalcView hook returning unchanged view data sometimes
Cached convar values
Add/remove hooks when their convar is enabled/disabled

Fix camera tool in thirdperson/worldmodel

Sway and bob now scales properly

Fixed bone scale being forced to 1 or 0 at all times

Viewmodel settings will now be reset properly after disabling
Worldmodel mode is more accurate
Prevented camera in worldmodel mode from clipping through walls
Changed thirdperson aiming
Added new positioning settings for thirdperson mode
Player model is now hidden in thirdperson mode when camera is too close
Improved crosshair on worldmodel and thirdperson modes

Fixed the crosshair being forced to draw if not in worldmodel mode

Fixed error while in some vehicles