Syndicate Bomb Tweaks

Syndicate bombs are now structures rather than items. This means they cannot be hidden in lockers and disposals anymore. They also can no longer be used as grenades by crafty traitors.

They now audibly beep as their timer counts down, which is a visible display that can be seen when examined.
Added missing .dm file
Added missing sound file
Updated the description of the bomb.
Merge pull request #878 from Ikarrus/kaboom

Syndicate Bomb Tweaks