[snipmatch] Bug 448064: Snippet sharing fails under Juno

require a minimum version of 3.2.0 for EGit
[misc] Address several Sonar warnings

* Made LogMessages classes final
* Made several util classes final
* Removed inefficient use of Maps.keySet in SubwordsSessionProcessor
* Added support for JavaSE-1.8 BREE in advisor

Change-Id: Id4dbd85622eb96d109390e4eca3aa96f7138bc12
Signed-off-by: Andreas Sewe <andreas.sewe@codetrails.com>