Memory Leaks in Restarting Activity

[Causeless]

When restarting an activity continually, the used memory keeps growing, so there's a memory leak somewhere.

Steps to reproduce the behavior:

1. Start a test activity
2. Place a whole bunch of actors in the scene
3. Start the activity
4. Press Ctrl+R repeatedly and watch memory usage rise

[HeliumAnt]

Memory leaks after reloading (Croc Maw bunker, with some Green Dummies)

[HeliumAnt]

Main Leaks are from everywhere with non-virtual destructors (GUI, and essentially everything else) and anything that uses Entity Pooling

[Causeless]

Note to retest this. We won't have caught all cases (given non-virtual destructors...), but I fixed a pretty egregrious issue where MovableMan was deallocating aligned off-by-one.