Reorganized controllers.

Moved the modal controllers into their own file; also renamed `SimpDnD4eCtrl` to `DnD4ePageCtrl` since it's job has changed to mostly being a controller for the page and the 'Simple DnD4e' system was renamed a while ago. Also renamed the file to bring it inline with the rest of the files.
Added edit buttons.

Added edit buttons to each of the edit reference modals, as well as adding menu entries for editing the various things that could be edited.
Renamed partials.

Renamed the `editfeat` and `editpower` partial to reflect their actual function.
Renamed functions.

Also had to rename the functions that triggered the modals I renamed; the were also incorrect.
Finished implementing editing of powers and feats.

Lots of changes and fixes; we can now edit both powers and feats.

Fixes #57. Fixes #66.
Implemented editing of classes.

Added this to finish rounding out the full suit of editing.
Merge pull request #69 from Morgul/feature-ccase-edit-powers

Edit Powers