API: KickBack function extension

[dystopm]

This modification extends the usage and hooking of the CBasePlayerWeapon::KickBack function which handles recoil control. In summary, the changes made were:

• Punchangle boundary fix: If your punchangles are already in a high value, shooting will clamp punchangle according to the lateral/up max angle value. This PR fixes that by ignoring if already having punchangle in an out-of-boundary value.
• KickBack params expanded: You can not force a lateral or up max angle value, or force a direction change probability.

By the mentioned points:

• Now every weapon uses KickBack. All other weapons just punches vertically, so KickBack needed a readjustment for those basic cases.
• This is useful for API consumption and event handling, so you can alter/handle every weapon recoil in a simple way.
• There's already a way to use and hook KickBack in reapi, so it will be easy to extend and implement your own custom weapons.
• The following modification maintains a very low probability of altering the original firing behavior, just in very, VERY specific cases (which are highly related to 3rd party plugins).