Extracted page editor view data gathering to its own class for
alignment. Updated the data used in views as part of the process to use
view-specific variables instead of custom attributes added to models.
Also moved tinymce library loading so it's not loaded when not using the
wysiwyg editor.
- Primarily moved and re-organised view files.
- Included readme within views to document the convention.
- Fixed some issues with page field select list in previous commit.
- Tweaked some route names while going through.
- Split some views out further.
Closes#2805
