Move Categories over to key/keyref from ID/IDREF

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Another instance of ID has been found in the Categories sub-schema. We can't use keyref, since the ref won't always be in the same file as the category, but we can (and should) use a <key> to identify the categories.

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(In r618) Re #297: Move Categories over to key/keyref from ID/IDREF

• Make category use a string for an ID
• Add key to system - key needs to be outside <complexType> so we can't put it in warfoundry-cats.xsd at the moment

TODO: Add matching code to Race, or find a way to "alias" and create a categories element that uses the type and the key within warfoundry-cats.xsd

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(In r619) Re #297: Move Categories over to key/keyref from ID/IDREF

• Initial tests for system category handling

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Tried adding "categories" element in Categories schema and referencing using <xs:element ref="cat:categories"/>, but this causes Mono to throw errors because it found system:categories, not cat:categories. Substitution groups and deprecation may be the best way to handle this unless something else can be found. In typical MS style, .Net on Windows didn't error.

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(In r623) Re #297: Move Categories over to key/keyref from ID/IDREF

• Add key definition to Race schema

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(In r624) Re #297: Move Categories over to key/keyref from ID/IDREF

• Add unit tests for races with category overrides

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Fixed in r624

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Retro-actively tag RC1 releases as released