Fixes ex_act() destroying too much shit

Borg modules are safe
So are items with bomb protection
Items in people who wear bomb-protective gear are safe too
No more fire inside walls

No more fire inside walls
Merge branch 'master' of https://github.com/tgstation/-tg-station into ExActFix
Ok now explosions shall work properly

Changed severity to target, make items not destroy themselves on
severity lower than 1, all that stuff
Proper handling of computers and tables by c4

Proper handling of computers and tables by c4
Merge pull request #6175 from Razharas/ExActFix

Fixes ex_act() destroying too much shit