fixes #36160 - Redefine append domain names setting

This PR aims to unify the format of host names stored in the database and the way they are displayed.
With this change, the name of the host is always going to be stored with the domain name appended.
The setting formerly named `append_domain_name_for_hosts` is now renamed to `display_fqdn_for_hosts`...

Fixes #32893 - use setting DSL for General category

This uses our new DSL to define the General settings, this showcases how
to use the new DSL and other categories should follow in the same
release.

Fixes #32752 - Don't allow editing readonly settings (#8608)

• Fixes #32752 - Don't allow editing readonly settings

• Refs #32752 - Move setting editing handling into the cell

Instead of having the table handle the modal and passing down the
callback to trigger it, move the editing logic into the inner cell....

Fixes #31723 - Show changes after setting update

Fixes #31603 - Fix setting for HTTP proxy

Fixes #31587 - SettingName fallback to name (#8235)

In 623542da3c16d4033b94317e0ac757021132b884 we've forgot to add fallback in fullName column to setting.name.
This adds fallback to `setting.name` if the `setting.fullName` is omitted.

Fixes #29257 - Remove x-editable-rails