* Get emmet completions from html,css extensions
* Resolve extensionsPath, use emmet results even if empty
* Support css abbr with :
* Refactoring
* Add some basic emmet tests
* Refactoring
* More tests
**Bug**
Most VSCode extensions currently specify `"exclude"` in their `tsconfig.json` but not `"include"`. This may result in extra files being included in each project
**Fix**
Add `"include": ["src/**/*"]` to all extension tsconfig files