Add ability to disable entity data in editor

1. Open a project
2. Go to stage workspace
3. Create an entity
4. Attach an entity data to the entity

There should be a checkbox or something to disable entity data. This isn't like it would be in other engines because entity data holds nothing but information, so disabling it would mean not to compile it into the game as the Init would never be called and thus rendering it useless. However, being able to disable things and quickly test would be a great help for debugging.

This action should also be added as a memento to editor history so it supports undo/redo.