Data sources config UI

Summary:
- Restructure messages and tools SCSS files
- Add data provider list and config
- Using dummy models to power views
- Generate backbone form based on data provider 'form' attribute
- Styling data provider config
  * data provider card/message sources
  * Data Provider Tab Nav
  * individual providers config template
  * Data Provider Selected States
  * hardcodes DataProviderConfigSms
- Hide new ui hidden behind feature config

Test Plan: None yet

Reviewers: shadowhand

Reviewed By: shadowhand

Maniphest Tasks: T250, T130

Differential Revision: https://phabricator.ushahidi.com/D123