Increment version number and/or add other build properties to version info

[kpine]

Per #21 there is now a launch splash screen and About dialog that show the OZW Admin version. However, the version is pinned to "0.1.0" so it's not very useful.

Consider adding some other properties besides a version number, such as date of build, Git commit SHA, and build number. The last one would be most useful for users as it refers back to a specific downloaded artificat.

[Fishwaldo]

Everything is now versioned and released on GitHub Releases. (preview builds will still be on bamboo).