ctf: Update project compiler settings

ctf: Update project compiler settings

Now that we have eliminated all compiler warnings in the code,
we could turn on "-Werror" to make sure no new warnings are
introduced (Hudson CI would fail building any Gerrit patch that
has warnings).

NLS warnings remain as warnings, so that they can be
suppressed in Messages or constants classes.

This only applies to ctf.core and ctf.core.tests. For ctf.parser,
since Maven also looks at generated code, we have relaxed the settings
to ignore any error/warning coming from the generated Antlr code,
over which we have no control.

Change-Id: I31422d54af59bd96f75d2c2ff130a58c8e9ad5f6
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/14205
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
IP-Clean: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>