Disable sieging town outposts

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• Towns with sieged outposts may have no reliable methods to get allies/nation members to the siegezone
• Defenders have to locate the siegezone and cannot reliably prepare for the siege

Describe the solution you'd like
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• Disabling the ability to siege towns outpost plots or plots connected to an outpost

Describe alternatives you've considered
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• Letting defending towns create Siege Teleports/SiegeCamps (Refer to Suggestion: SiegeWar TP #1)
  • Sieges that may not be expected will not give towns enough times to travel to the location and create a teleport/camp

Additional context
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• If town blocks are connected to the homeblock & outpost block then allow the siege