Repairs and expands the staff of change:
*Staff of change now has a 20% chance of turning you into a simple animal (all have been tested to make sure they're properly controllable.
*Staff of change now works on simple animals, adding on_hit doesn't double up damage on simple animals or try to inflict non-brute damage because it's hardcoded to avoid inflicting damage to animals in the generic projectile. Special guns seem to work fine on animals (like the syringe gun for example).
*Mutant races were not updating properly thanks the DNA revamp, so that's been fixed and expanded to include all current races.
*Transfering identity for MMI's in newly created robots has been disabled for animal -> robot because it doesn't work properly for them, robot -> robot also apparently NEVER worked and has likewise been disabled.
Fixes my extra side of potatos
Removes the !isanimal and !isrobot checks from robot creation. A fix has been suggested for the pull currently dealing with MMI that will stop the runtimes. https://github.com/tgstation/-tg-station/pull/1529
Keep in mind that if that request is not ultimately pulled the fix will need to be added to this pull to prevent runtimes from the game trying to take DNA from non-carbon based life.
Merge pull request #1535 from Incoming5643/StaffAnimation

Repairs and Expands the Staff of Change