[XB] XFMG: Attachment Mirroring Album 2.0.3

XF 2.3 support
Min XF requirement changed to 2.3.x

2.0.2 Patch Level 1:
- Fix: check for third-party add-on tables existence before applying changes

2.0.2:

• Feature: forum setting to set default mirroring album category
• Feature: input to enter album url instead selection dropdown
• Feature: XenAddons/CAS ads & items support
• Fix: filter viewable categories/albums
• Fix: "expected parameter of type '\XF\Mvc\Reply\AbstractReply', 'null' provided" error
• Fix: broken existing attachment mirroring 3rd party add-on content

2.0.1 Patch Level 2:

• Fixed template modification incompatibility with XF 2.2.13
• Fixed:

Expected parameter of type '\XF\Mvc\Reply\AbstractReply', 'null' provided
error

2.0.1 Patch Level 1:
- Fix: "Call to a member function canAddMediaMirrorAlbum() on null" error

2.0.1:

• Refactor: optimize existing attachment mirroring
• Fix: unlink mirrored media from previous container on new mirroring album create
• Fix: properly cache mirror containers
• Fix: number of tabs from thread view does not match with album view

Fixed undefined variable in MediaAlbumMirror::applyMirrorAdd