Implement server-wide open group user bans and unbans.

[Bilb]

PR made from https://codeberg.org/gravel/session-desktop

My fork is somewhat documented at https://sessioncommunities.online/handbook/#additional-moderator-tools:

• (message right click menu) The Allow sending attachments and Remove attachment exception options allow moderators to grant or revoke upload permissions for regular users.
• (message/room nav right click menu) The Ban User from Server and Unban User from Server options allow global moderators to ban a user from all Communities on a given server.
• (conversation options) The Edit Permissions submenu allows admins to set default permissions for a given Community.

My fork can set +u and =u on users, ban/unban users server-wide, and set +/-rwua on rooms.¹

It's not easy to merge, but the first one (upload permission) would be a priority.²

My implementation has issues:

• Both options (+u and =u) are visible at the same time.
• Users without +u can still attempt to upload (upstream issue).

These are fixable, but I don't have the in-depth knowledge. Namely:

• Clients don't track user permissions.
• Clients will let users upload the rooms regardless of permission.
• No code path for replying to media messages without +u (thumbnail reupload).

For my fork, I had to write custom CI code for Woodpecker.
I would appreciate help with building my fork for Windows
... You could try mirroring it to GitHub and see if it builds.

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Notes for global bans and room permission editing:

• All of +rwua options are on by default when editing room permissions.
• Non-global admins see global ban buttons.
• Have to roll your own SOGS If you need "server ban and delete all".
• I use some legacy UI code.

And the issues to fix before merging these:

• Clients do fetch, but don't track room permissions.
• Clients do fetch, but don't track self global mod status.
• "Ban from Server and Delete All" is only supported on the dev branch of pysogs. Also, needs a marker in 'capabilities'.
• My room permission submenu would need new UI code.

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¹ Fork features: https://sessioncommunities.online/handbook/#additional-moderator-tools
² Upload permission support is lacking. Global bans are used just by a few people and admins use special commands for +w/-w; see https://codeberg.org/gravel/pysogs-sql-triggers.