RFE: CMake target creating distribution

[zbeekman]

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Request for Enhancement (RFE)

Create a target so that CMake can make dist too... this should:

• NOT create a tag... that should be done by the dev ahead of time, and should be a PGP signed tag
• Compute latest tag from git describe
• git tag --verify (or whatever correct syntax is) the latest tag
• git checkout the latest tag
• git archive --prefix= etc. the latest tag
• Compute the SHA256 and write to file for the latest tag
• Compute the detached PGP signature for the latest tag
• Verify SHA256 file signature
• Verify SHA256 of tarball
• Extract tarball, build and run tests

[zbeekman]

The checked items have been implemented in a make dist target. I'm going to leave the unchecked items as is. Some of them should definitely be performed on Travis-CI when testing a tag.

I'm going to close this when the enhancements hit master, although some more work should be done in the future to address the additional points especially if we have Travis-CI package releases for us. (Also requires fixing gpg private key upload & encryption etc...)