tmf: Add function name mapping to the Callstack View

tmf: Add function name mapping to the Callstack View

Initial version of the "function name mapper" for the Callstack View.
It currently only supports a text file listing addresses followed by
names, like the output of "nm [binary] > out.txt".

The next steps will be:
- Add support for reading the binary directly, by tapping into the
  relevant CDT components.
- Add a separate dialog that shows the currently imported file name(s).
- Add support for dynamically-loaded libraries. This will require some
  work on the tracer side.

Change-Id: Id622cce487965b8c770fc40218685ec7605924ff
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/17978
Tested-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
IP-Clean: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>