Version code extensions

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For projects with multiple APKs it might be nice to slot in other values (API-level, Platform, Screen size, etc.). Right now this is kind of tricky to do.

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As mentioned in #31 there could be a user-customizable list of digits to fill in with different content.

Considerations:

• Don't exceed 2100000000. (https://developer.android.com/studio/publish/versioning.html#appversioning)
• Consider API Level (e.g. 25=N) and Screen Size (e.g. 34=xlarge) as components of the version code (https://developer.android.com/google/play/publishing/multiple-apks.html#VersionCodes):

So here's a provisional list of inclusions:

• SS (screen size)
• AA (API Level)
• M (major version number 1.x.x)
• N (minor version number x.2.x)
• P (patch version number x.x.3)
• BBBB (build number, e.g. 2838 for number of commits since beginning)
• UUU (update number, e.g. 102 for number of updates since last tag)

Others?

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As discussed in #31, we would call this codeFormat.

parts and multiplier would be deprecated with this change. They should continue to function as-is where codeFormat is not supplied for backwards compatibility.

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(mostly) fixed in 0.3.0 / 5235644

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(Didn't do BBBB, SS, or AA. Maybe later.)

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Let me know what you think @artky -- hopefully this will address your use case well!