Add the ability to edit the title of a group.

Signed-off-by: Tyler O'Meara <Tyler@TylerOMeara.com>
Add the ability to modify the ID of a group.

Signed-off-by: Tyler O'Meara <Tyler@TylerOMeara.com>
Retain GroupCategory membership when changing a group's id.

Signed-off-by: Tyler O'Meara <Tyler@TylerOMeara.com>
Merge pull request #348 from Acidity/feature/groupsQOL

Fix some Quality of Life stuff relating to groups.