WarGoals data initial commit

[Goosius1]

Description:

• This PR is not targeted at master, but instead at the epic branch for the WarGoals feature.
• The idea is to build the WarGoals feature using multiple small PR's to the epic branch, then finally when a pre-releasable version is implemented and tested, merge the epic branch to master.
  • Advantage: Each PR can be small.
  • Disadvantage: Each PR will only deliver only part of the required code, so most early PR's won't be testable for game effects.
  • However, each PR can be reviewed for syntax errors, logic errors, any applicable standards etc.
• This particular PR adds the metadata support needed for the feature
• Note that currently the design is quite fluid, so it to avoid confusion with changing requirements, I suggest reviewers focus on more general aspects in the early PR's.

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New Nodes/Commands/ConfigOptions:

N/A

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Relevant Issue ticket:

Part of #335

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• [N/A] 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 SiegeWar License for perpetuity.

[Goosius1]

• On hold for now.
• I have an alternative idea which I am currently pursuing to deal with war motivations.