Fix #2872

When use builtin SSH server with concurrent operations, there are probabilities
One connection could use the command from another connections.

Fix this by set SSH_ORIGINAL_COMMAND for each command, not set in global scope.

- add border-radius to filter list items
- use color as background of label for issue/pull view page

- update glide info

Add proper escaping of '#' in branchname in compare when doing pull
requests. This addresses issue #2822.

Set the description meta tag correctly when there is no repo
description. Also use the  ability to trim trailing whitespaces,
to make the template cleaner.

Use the authors name, and the description of the repo in HTML meta.
Pages without repository context will display as before.

- Fix go-gogs-client#10
- Related to #809

No guarantee for compatibility with future changes

Both are possible on explore and admin panel

Collaborators have write access as default, and can be changed via repository
collaboration settings page to change between read, write and admin.

- Allow to delete current avatar

Use hand-written SQL to do complex query