Moves beam rifle snowflake code up to projectile level for a proper hitscan system.
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rscadd: Chameleon laser guns now have a special firing mode, activated by using them in hand! Only certain gun disguises will allow this to work!
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* Add basic structure of z-level traits
* Restore space transitions and add z-level debug verb
* Restore proper ruin spawning and transit level creation
* Replace station_z_levels and related checks with traits
* Eliminate more uses of ZLEVEL_{STATION_PRIMARY,LAVALAND}