Bump Code 2: Electric Bumpaloo

Mobs now have flags deciding what kind of mobs they can mess around with.
This means monkeys will no longer attempt to push humans. Hurrah for xenobio.
Fixes #2903, silicons can now push anything but can't swap with humans.
MoMMIs can swap with any mob but can't push any mob.
Added a proc and 3 vars to handle all this code.

code/modules/mob/living/silicon/robot/robot.dm

@@ -42,6 +42,10 @@
 
 	var/datum/wires/robot/wires = null
 
+	mob_bump_flag = ROBOT
+	mob_swap_flags = ROBOT|MONKEY|SLIME|SIMPLE_ANIMAL
+	mob_push_flags = ALLMOBS //trundle trundle
+
 	var/opened = 0
 	var/emagged = 0
 	var/wiresexposed = 0