Bug 500144 - More compiler warnings by default in o.e.help 

Enabld the following warnings and fix them:
* empty statement
* indirect static access
* try-with-resources not used
* raw types usage
* few others for which the codebase was already clean

Change-Id: I24e50a01af56f098bc2228b62eec0ac98a98d48d
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
21 files changed