Added IssueType model and accompanying database schema generation code. NOTE: The IssueType_Id on the Issues table is currently nullable due to no data. Need to update this relationship once data has been manually added.
Enabled required constraints for issue type.
Root now contains a list of issue types.
Added issue type to details page. User is able to change an issue's type.
User can now filter issues list by type.
Added sort by issue type to the issues list page.
User can now create an issue with a type.