Advertising brochures in mailboxes

[Hansendiet]

Summary

Content "Added six different advertising brochures which reveal the map and now spawn in mailboxes"

Purpose of change

Fixes #62066
It was always kinda weird to me that people living in an area would receive tourist maps or trail guides, so I added six different advertising brochures which reveal different groups of buildings on the map. In my opinion this is a way better fit thematically.
I will probably do a lot more work on the entire postal system in the future since I think it is kind of underutilized, but this seemed like a nice first issue to ease myself into the project.

Describe the solution

As stated above, added six advertising brochures that reveal different groups of buildings on the map and added them to the mail spawngroup. Also removed the touristmap and trailguide from the mail spawngroup.

Describe alternatives you've considered

Leaving it as is, but my passion for mailboxes would not allow for that.

Testing

Spawned into the world and searched a lot of mailboxes. All of the brochures spawn at approximately the correct rate and reveal the correct buildings.

Additional context

[github-actions]

Spell checker encountered unrecognized words in the in-game text added in this pull request. See below for details.

Click to expand

• This is a small brochure advertising for local malls with an address below each entry. Using it will add roads an local malls, strip malls and megastores to your map.
• You add roads and local malls, strip malls and megastores to your map.

This alert is automatically generated. You can simply disregard if this is inaccurate, or (optionally) you can also add the new words to tools/spell_checker/dictionary.txt so they will not trigger an alert next time.