- Fix crashes after OU/user creation attempts by users with
  corresponding delegated rights.

- Fix OU insufficient access for users with delegation. Users with
  delegated OU rights can do corresponding allowed actions. In particular,
  user/group creation/deletion, OU creation and policy (un)link.

- Fixed policy link deletion: OU's child link items are deleted from
tree after removal from policy widget. (closes: 49670)
- Update backend files for Samba 4.20 compatibility.
- Fix admin domain definition method.
- Fix crash after optional attributes load.
- Fix optional attribute display bugs with enabled LAPS.
- Fix crashing after domain object properties apply changes.

- Add drag&drop policy link order changing to links tab in the policy OU
  widget.
- Domain info widget: "Servers" items are removed from the tree and
  domain controller version is added.
- Add link state icons (enforced/disabled) to the links tab from the
  policy OU widget.
- Domain policy link broken deletion is fixed (the same links in other
  OUs were deleted instead of domain's link). (closes: 49385)
- Fix broken domain policy link icon changing: enforcing/disabling
  from policy widget changed another OU's the same policy link icon.
- Fix links duplication in policy OU widget's inheritance tab.
- Fixed user properties window resize.
- Add optional attributes loading. It can be performed via "Load
  optional attribute values" option checking (in the preferences menu)
  or with corresponding button in the attributes tab. (closes: 48817)
- Fixed not selected of any theme after ADMC start.

- Removed missing theme error log on first launch. (closes: 49043)

- Add icon theme selection. System theme is taken from /usr/share/icons
  dir, custom themes are taken from /usr/share/ad-integration dir
  by default. Theme dirs must have index.theme file to be included.
  Theme dirs can also be symlinks.
- Object creation and disabling bugs in 0.15.0 version are
  fixed. (closes: 48780)

- Append AD-integration color, AD-integration duotone, AD-integration line
  and Kora AD-integration themes. These were tested only in ADMC context and
  can be expanded for other projects (like GPUI).