* remove dragon system usage of GenericAntag
* add AntagRandomSpawn for making antags spawn at a random tile
* add AntagSpawner to make an antag spawner just spawn an entity
* add antag prototype for dragon since it never had one
* make dragon spawner a GhostRoleAntagSpawner, remove GenericAntag
* make dragon rule use AntagSelection and stuff
* remove dragon GenericAntag rule
* add back to spawn menu
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Co-authored-by: deltanedas <@deltanedas:kde.org>
