Remove unused HAML and Mustache templates

* Also remove server-side-rendered tooltips
Comment out several unused chunks of Javascript
Show context for access mappings in event log
Merge branch 'develop' into feature/cruft-removal
Removing unused controllers and app scripts
Refactored model class files into models folder, and split up simple_models.js
Removed commented out code; restored reset functionality for request filter
Removed unused mustache helpers
Grey-out and disable import button when no file selected.
Moved control and category models to models folder
Removing unused code from control and category models
Fix eager loading for various endpoints

* Fix use of `undefer_group` and `subqueryload`
* Fix `ControlCategorized.eager_query`
* Ensure `get_current_user_json` actually uses eager loading
Removed mapping controller
Removed unused add_widgets controller
Removed unused sha1.js library
adding cancel text where it's missing for task groups
disabled open/close in object inner nav
changed cursor when rearranging tasks in task groups
fixing disabled inner button
adding 2nd tier for tasks and people widget. Fixed 2nd tier trigger