Add Army support to WarFoundryFactory

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As well as saving armies in #53 we need to be able to load them back in to WarFoundry. The WarFoundryFactories should handle Army files.

This ticket isn't necessarily dependant on #53 as test files can be created by hand.

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Remove owner so that the team can more easily see bugs. Using default owners seems good at first but is bad practice when a team can be working on any part of the project.

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(In r201) Re #53: Create XML army saver

• Fix file extension (noticed while working on re #54)

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(In r202) Re #54: Add army loading support

• Add method to loader to try to load an army from a specific file

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(In r203) Re #54: Add Army support to WarFoundryFactory

• Stop "custom equipment" node being mandatory
• Remove unused "ratio" definition
• Change "integer or ratio" definition to "integer or percentage"
• Use "integer or percentage" definition in army XSD
• Add exception to say that required objects were missing (Game System and Race)
• Throw exceptions on creating army if game system or race is missing

Re #53: Add saving of Army to XML file

• Add namespace attributes to XML root node

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(In r204) Re #54: Add Army support to WarFoundryFactory

• Correct name of fetched attribute for game system in army file

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(In r205) Re #54: Add Army support to WarFoundryFactory

• Make sure that race and sub-race IDs are lower case so that we can find them when we load

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(In r208) Re #54: Add Army support to WarFoundryFactory

• Separate out army parsing to a separate class to make unit loading easier

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(In r210) Re #54: Add Army support to WarFoundryFactory

• Add starts of army unit loading

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(In r211) Re #54: Add army loading support

• Fix exceptions when loading army with units:
  • Remove obsolete methods
  • Add EnsureLoaded call to various getters to make sure that all required values are always loaded

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(In r212) Re #54: Add army loading

• Add unit to army once it is loaded

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(In r214) Re #54: Add army file loading

• Add equipment loading (currently fails because of ID mismatch - in the test race we create UnitEquipmentItems with the ID Empire1equip1 but in the army saving/loading we use equip1)

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(In r215) Re #54: Add army loading

• Fix army loading by writing out the correct ID for the equipment items when we save

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(In r216) Re #127: Unit creation always assigns default equipment

• Add and use new constructor for Unit that doesn't assign default values

Re #54: Add Army support to WarFoundryFactory

• Load unit name and unit size

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(In r217) Re #54: Add Army support to WarFoundryFactory

• Handle empty string as well as null for ID to mean "auto-generate"

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Core loading now appears to be working. Ticket #130 created to follow up with "extra" functionality.

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Mark released changes as released

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Mark released fixes as released using radio values

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Mark fix as released under a previous version