Instance Deactivation Bug 1

[polygoned]

Reactivating instances after using instance_deactivate_all() crashes enigma.

[JoshDreamland]

The instance activation system is going to be entirely redone when we support threading. Deactivated instances will be placed in a dead thread. It will prevent code duplication. No one bother exploring TGMG's existing code for longer than a few minutes; after that, just give up.

[polygoned]

added to #427

[RobertBColton]

I've checked this off of #427 because I can't reproduce it.

I created the following test GMK in GM8 which works fine on current master:
instance_deactivate_all_reactivate_test.zip

Use spacebar to deactivate all object1 instances (with instance_deactivate_all(true) from object0) and enter to reactivate them (with instance_activate_object(object1)) from object0. Works fine in ENIGMA on current master, no crash even under gdb.

This one may have been resolved by #874