Fix nunez bullet trailer appearing out of nowhere

[Procyonae]

Summary

Bugfixes "Fix nunez bullet trailer appearing out of nowhere"

Purpose of change

Fixes #77877

Describe the solution

Obsoletes the old EoC that was stored in memory bc it was recurrance
Renames the new EoC
Fixes bullet trailer rotating
Adds a roof to the bullet trailer
Stops the bullet trailer spawning in the fence for two ranch_camp_55 rotations

Describe alternatives you've considered

Changing the cursed palette of the trailer proper

Testing

Simplified the EoC to test it on all rotations

  {
    "id": "EOC_Nunez_Travel_To_Tacoma",
    "type": "effect_on_condition",
    "effect": [
      {
        "mapgen_update": "tacoma_nunez_trailer_arrive",
        "om_terrain": "ranch_camp_55"
      }
    ]
  },

resulting in

Additional context