refactor(Ext JS 5): DO NOT MERGE

- [x] main
- [x] about
- [x] components
     - [x] tree
     - [x] properties
     - [x] methods
     - [ ] bindings
     - [ ] viewmodels
- [ ] stores
- [x] layouts
    - [x] box layouts
    - [x] overnesting
    - [x] layout runs
- [ ] events
- [ ] mvc