Alert refinements, new modal logic, set up sign-in interception

 - Alerts are now directed to the modal or the main body

 - Converted all modals to newer promise / return technology

 - Set up global switches for which modals are open

 - Enabled Registration from the Sign In page

 - Refactored Improve Proposal object into complex object

 - Removed all "user_id"s from Improve and Support server update requests for security reasons.

 - Updated look and feel of modal buttons, removed _"check marks"_