Add ability to limit setting spawn points lower than a configurable Y level.

[LlmDl]

Description:

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New Nodes/Commands/ConfigOptions:

  - New Config Option: spawning.y_limits.enabled
    - Default: false
    - Should towns, nations be limited in how low they can set a spawn point, or a outpost spawn point?
  - New Config Option: spawning.y_limits.lowest_y_allowed
    - Default: 0
    - When limiting is configured, what is the lowest y level allowed?

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Relevant Towny Issue ticket:

Closes #7306

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• I have tested this pull request for defects on a server.

By making this pull request, I represent that I have the right to waive copyright and related rights to my contribution, and agree that all copyright and related rights in my contributions are waived, and I acknowledge that the TownyAdvanced organization has the copyright to use and modify my contribution under the Towny License for perpetuity.

[Warriorrrr]

This could just be in a seperate plugin in my opinion

[LlmDl]

Yeah that was my first reaction too

[LlmDl]

Closed by https://github.com/LlmDl/TownySpawnPointLimits9000