Cuffs - Handcuffs and Restraints

* Minor code cleanup

* Removed magic strings and inline UI text. Binds and translations can now easily be configured in the shared autorun Lua file.

Fixed an issue preventing `CuffUnbreakable` from applying.

Added `SWEP.CuffUnbreakable` setting for weapon files.

Optimisations in the PhysgunPickup hook.

Improved cleanup optimisation.

1. Added text when multiple-use restraints are on cooldown.

Updated 2017-10-16 17:07

1. Added SWEP.CuffsCanArrest and SWEP.CuffsCanAutoArrest variables to fine-tune which restraints affect arrests. Has no effect when cuffs_restrictarrest and cuffs_autoarrest are disabled, respectively.
2. [DarkRP] Arrest and Unarrest batons now have priority over gagging a restrained player, when the option is available.

Updated 2017-01-17 13:23

1. Fixed spectators interacting with restrained players.

Updated 2017-01-15

1. Fixed a Lua error.

Updated 2017-01-05 15:15

1. Improved server-side performance.

Updated 2016-07-05 12:14

1. Added convar cuffs_restrictvehicle [Def 0] Prevent restrained users entering vehicles.

Updated 2016-05-30

1. Fixed an optimisation issue.