Fix writing of object properties in EU

The object property structure has a different size in EU and EW. When
converting from json to binary we need to know the target version in
order to produce the right format.

This adds the version to all the functions that build xcom objects from
json, although several don't need the version yet.

Fixes #20

Fix EU save writing

Fix decompression of EU saves

The decompression code was missing a version case for EU (15) and would
fail to read Enemy Unknown saves.

Handle ambiguity in array kind determination

Turns out that reading a "None" as the first element of an array
doesn't necessarily mean it's a struct array where the first element
has all default values -- "None" can also appear in enum arrays,
presumably where "None" means the 0 value of the enum (unconfirmed).

This has been observed in the
XGExaltSimulation.m_arrCellLastVisibilityData checkpoint element,
where the first element is "None" and the second is an enumerator
value.

Since this is ambiguous, we need to keep scanning ahead at subsequent
array elements to figure out what kind of array this really is. It's
in theory possible that all the elements will be "None", although I
haven't seen this yet. If that can happen we have no recourse except
to hard-code particular known arrays with the correct type as per the
UPK file or actually read the UPKs to determine what shape the array
has.

Readme and comment updates

Add support for Android saves

Android save support now working.

Android saves use version 0x13 for the save file (vs 0x10 for the PC
version of EW). The Android saves differ from PC in several key ways:

- Android saves have no header checksum, just the compressed data
checksum. It occurs in the same place as for PC, and is the same CRC32B
algorithm.

- The compressed data section of Android saves are compressed using zlib
instead of lzo.

- There is also a small bit of data after the checksum in the header but
before the compressed data. This may be Android profile related?

Merge branch 'master' of github.com:tracktwo/xcomsave

Merge branch 'master' of github.com:tracktwo/xcomsave

Update compatibility with VS2015 and debug options

- Add -EHsc flag to windows build
- Guard the generation of the debug "output.dat" containing uncompressed save data under _DEBUG.

Handle struct array properties whose first element is a struct with a…

…ll default values.