These are the files with just tiny tweaks. Mostly modify an object's attackby so it does "return ..()" instead of "..()".
If there are other things in this commit, the PR's description will explain them.
Merged kill_count and range var into one var/range for obj/item/projectile.
Simplified projectile/proc/Range().
Fixes timestoped projectiles still calling Range() and thus being deleted despite being stopped.
Fixes projectile being invisible when on the first tile in front of the shooter (which meant no sprite showing when shooting a target 1 tile away)
Simplifies kinetic/Range()
