Switch building uber JAR from assembly to shade plugins; exclude dep …

[scottkurz]

…version.properties; add git.properties

This change will make it easier to look at this JAR in an install, on disk, and see exactly what was used to build it, especially in the snapshot phase.

[iloveeclipse]

Is there any chance to implement that feature for AbstractTextEditor?

Sure, please work on a proposal & push a PR to discuss it.