- export `GetUnitsByGroupID`
- add `GetGroupUnit` function to retrieve a specific unit in a group
- add `GetMaxGroupUnit` function that returns a specific type of group unit with the highest permissions granted
- add `CanCreateIn` field, which determines whether a team can create new subgroups or repositories within a group
- add `AccessMode` field that determines a team's general access level to a group (as opposed to a specific unit)
- add `UpdateTeamGroup` function that either updates or adds a `GroupTeam` to the database
- update `HasTeamGroup` to also check that a team's access level is >= `AccessModeRead`
- add `SortOrder` field to `Group` struct (to allow drag-and-drop reordering to persist across refreshes)
- add method to return `/org/` prefixed url to group
- refactor `FindGroupsByCond` to take `FindGroupOptions` as an argument to be chained to the provided condition
- ensure that found groups are sorted by their `SortOrder` field
- modify `LoadParentGroup` method to immediately return nil if `ParentGroupID` is 0
- add permission-checking utility methods `CanAccess`, `IsOwnedBy`,`CanCreateIn` and `IsAdminOf`
- add `ShortName` method that returns an abbreviated group name
- add `GetGroupByRepoID`
- create `CountGroups` function
- create `UpdateGroupOwnerName` helper function to be called when a user changes their username
- refactor `MoveGroup` to allow moving a group to the "root" level (`ParentGroupID` = 0)
* move error-related code for groups to its own file
* update group avatar logic
remove unused/duplicate logic
* update `FindGroupsOptions.ToConds()`
allow passing `-1` as the `ParentGroupID`, meaning "find matching groups regardless of the parent group id"
* add `DedupeBy` function to container module
this removes duplicate items from a slice using a custom function
* add `SliceMap` util
works like javascripts's `Array.prototoype.map`, taking in a slice and transforming each element with the provided function
* add group service
functions included so far:
- avatar uploading/deletion
- group deletion
- group creation
- group moving (including moving item inside a group)
- group update
- team management
- add team
- remove team
- update team permissions
- recalculating team access (in event of group move)
- group searching (only used in frontend/web components for now)
