temp: gestalt-di migration changes

[BenjaminAmos]

Contains

This pull request migrates the majority of Terasology to actually use Gestalt DI. It significantly refactors and re-architects the fundamentals of the application, making a concerted effort to finally eliminate CoreRegistry once and for all.

Along with plenty else that I am unable to recall since this has been near untouched for months. There are some notes on architecture that I wrote included in the docs/EngineStartUp folder but I cannot be sure of how closely they match the current state of the code at this time.

How to test

Absolutely everything needs to be tested again. No code is safe from this refactor. Getting all the tests passing would be a good first step.

It is also rather hard to test anything apart from the unit tests until the input issue is fixed.

Outstanding before merging

• Merge temp: gestalt-di migration changes Terasology/ModuleTestingEnvironment#79 (or some variant thereof)
• Merge feat: array/list parameter support for Gestalt-DI annotations gestalt#160
• Testing everything
• Fix no input being detected (although this may also be present on develop?)