2.0.0-RC1

chore: update to PHP 8
refactor: Accept Horde\Util\Variables in most places which accept Horde_Variables
docs: create/update conf.php.dist
fix: More defensive code when trying to drop tables
docs: Clarify where to put local overrides
Merge pull request #2 from amulet1/autoload_renderer
fix: Modify VarRenderer class name to facilitate autoloading
fix: Drop unnecessary / uninitialized form parametet
fix: getInfo() no longer writes back to second parameter. Use return value.
Mark as a H6 app.
Signature compatibility fixes
Update metadata and workflows for PHP 8 support
Add CI job for satis repo update
Development mode for sesha-2.0.0alpha3