Show unit cost in army tree

[ibboard]

As per #163, but for the army tree - make sure that the categories and units show total costs so that users can track more than just total army cost.

[ibboard]

(In r268) Re #164: Show unit cost in army tree

• Do prep work and create "ICostedWarFoundryObject" interface that defines objects with a "Points" property
• Implement new interface where necessary
• Deprecate old variations on "points value"
• Remove references to deprecated code

[ibboard]

(In r269) Fixes #164: Show unit cost in army tree

• Add points value in army tree for units, category and army (aggregating as it goes up the tree)
• Add code to update tree node text as points values change
• Remove references to now deprecated points-related properties

Also:

• Add rolling log file appender to logging config

[ibboard]

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