Changes

ctf: Remove activator from o.e.tc.ctf.core

Replace the log calls using the activator with Platform.log(), if
platform is running else use JUL logging. The later is useful when
CTF parser is used outside of Eclipse plug-ins.

[Updated] Remove activator from o.e.tc.ctf.core

Change-Id: I2e1acb4826f0452ec4e8000b685a810d8560f946
Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/205759
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>

ctf: Replace NonNullUtils#checkNotNull with Objects#requireNonNull

Follow Java standard and remove a dependency to o.e.t.tmf.common.core

[Changed] Use standard nullchecks in CTF parser

Change-Id: Ib1b65deebbac0de899b966c03639adf4cb988251
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/205779
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>