* Add initial draft of SCOPE document
* Rephrase/rename feature tiers
* Rename to FEATURES and add a few annotations
* Fix API Reworks table
* Add more annotations
* Some phrasing
* Split compat matrix into seperate section, to be moved into wiki
* Mention compatibility in CONTRIBUTING
* Remove some discuss annotations
* Apply review changes and rename child windows feature to popup windows
* Update based on discussion
* Add issue for Android HiDPI
* Update FEATURES.md
* Update FEATURES.md
* Update PULL_REQUEST_TEMPLATE.md
* Update PULL_REQUEST_TEMPLATE.md
* Reformat FEATURES.MD
* Remove comments
* Improve formatting and add guide for extending #Features
