FTR: Bullets Might Ricochet Off the Wall

[proof88]

CVAR for this will be "bullet_ricochet".
This is NOT the same as the "bullet_bounces" CVAR (#180).

If "bullet_ricochet" is enabled, the number of bounces will be still controlled by the "bullet_bounces" CVAR. The "ricochet" phenomenon is not the same as how the grenade is "bouncing" off the walls, because e.g. the grenade is always able to bounce of the walls, while "ricochet" requires other precondition as well, like the angle between the bullet and the wall!

Preconditions:

• fast collision check for bullets is implemented: CR/OPT: Fast Bullet Collision Check #149 ;
• FTR: Bullets Might Bounce Off Walls #180 .