Use maven-shade-plugin to shrink size of the clover.jar

[marek-parfianowicz]

Current JAR has 15MB, it’s quite a lot, especially if it is being bundled in CI (e.g. Bamboo).

Use maven-shade-plugin (alternative: Proguard) to remove unused classes from the JAR. Watch out for indirect references (e.g. reflections, template languages like Velocity).

Do not obfuscate the code.

[marek-parfianowicz]

Original report: https://bitbucket.org/openclover/clover/issues/102

[marek-parfianowicz]

Changes:

• repacked third party libraries by maven-shade-plugin instead of jarjar
• got rid of most of the clover-xyz libraries, now third party libraries are direct dependencies
• reduced size of clover.jar from ~15MB to ~8MB
• size of clover-runtime.jar did not change (minimization is disabled as it was cutting classes from Cajo)