Multi Scene Manager

The idea of this project is to improve Unity's Multi-Scene editing workflow.

Unity is currently lacking support for saving a group of scenes as a unit, so that you can later load the full group in one step.

The plan is to support:

Favorites: Being able to name a group of scenes and be able to load them all with one click (Normal or Additive)
Favorites should be able to inherit another Favorite so you can make a specialized version that has some common group of scenes
- For example (common "Gameplay" Favorite with "Level1" specialization)
  - "Gameplay" Favorite
    - Gameplay Logic scene
    - Hud scene
  - "Level 1" Favorite
    - inherits from "Gameplay" Favorite
    - adds the Level1 content scene
It should be easy to have different contexts for favorites, project favorites, developer favorites, test favorites
It should be easy to manage the favorites definitions

Right now this is just super temporal barebones work in progress