Make Ajax request when deleting an uploadable block

When deleting a block which has the `uploadable` mixin, make an Ajax request so that the attached file can be deleted by the server
Remove debugger
Set UID
Ability to hide block control titles
Yeti branch
Merge feature/delete-uploaded-file
Don't show st-icon text
Use <h1> for heading
H1ify
H1ify
Remove H1ifing
H1ify
Template for image block
Execute function
Selector for image size
Added position dropdown
Label for dropdown
Build dropdowns
Add log
Fix rendering object