* Basic group management
* Assign cards to groups
* Fix lint
* Fix findbugs 'dodgy code'
* Group name as unique key
* More group tests
* Import/export groups
* Implement group renaming and deleting
* Fix findBugs
* Fix chip marking in edit activity
* Group import/export tests
* Fix some state bugs
* Some last fixes
* Remove redundant if statement
* Fix findBugs
* Deduplicate code
* Cleanup
* Fix groups not showing up with new card
* Fix capture and enter button touching
* Fix dialog button look
