Add extracting of ArmyBuilder files

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The current Army Builder API can read the file table for .ab files, but the initial code for extracting won't work - all supported compression formats fail. To make Army Builder support as useful as possible we need to be able to read data from .ab files.

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Zip error: Header checksum illegal
GZip error: Error GZIP header, first magic byte doesn't match
BZip2 error: BZip2 input stream bad block header

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As per the wiki page, it looks like the files may be compressed using a proprietary "Greenleaf Compressor" as Lone Wolf Development used a library from Greenleaf that does support PKZip, but also supports its own format.

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(In r119) Re #75 - Extract Army Builder files

• Fix code compilation issues (still can't extract)

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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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Moved to milestone 0.2 as we know what the compression is (Greenleaf's custom compression) but not how to decompress it. #136 gives us a better starting point to work from.

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Move tickets to new "confirmed" status to show that they've been checked