Reduce TTL of debris for #31.
Destroy debris upon bullet hit (but do not touth the bullet).  #31
Less annoying sounds for shooting.  #31
Number 6 of #31 - limit max touch damage of guards to 8.
Change reload times again plus do not spawn bullet when facing wall; for #31.
Add ricochet, make shooter immune to their own bullets.  #31
Merge branch 'feature/31-less-annoying-gameplay' into develop