Common Editor Features

[NGPixel]

### Tasks
- [x] Edit Title
- [x] Edit Description
- [ ] Edit Icon
- [x] Edit Alias
- [x] Edit Publishing State
- [x] Edit Relations
- [ ] Edit Javascript (On Load / On Unload)
- [ ] Edit CSS
- [x] Show/Hide Sidebar
- [ ] Set ToC Depth
- [x] Show/Hide Tags
- [x] Edit Tags
- [x] Upload Pending Assets