[platform-debug-dev] accessing LaunchConfiguration from a tab

["Mike Frysinger" <vapier.adi@xxxxxxxxx>]

i'm creating a custom debug interface (LaunchConfigurationTabGroup)
with multiple tabs.  the first tab is used to display a bunch of
common profiles/templates which reconfigures the values on all the
other tabs.  the easiest way to implement this from what i can see is
to get access to the working copy of the LaunchConfiguration and
tweaking the values there.  this also has the advantage of being able
to reuse existing tabs from other plugins without having to copy them
in their entirety.

but i cant seem to figure out how a tab can get access to this
information.  a LaunchConfigurationTab cannot directly access the
LaunchConfigurationTabGroup it is a part of, nor can a
LaunchConfigurationTabGroup access the
LaunchConfigurationTabGroupViewer it is a child of.  if a tab could
get up to its parent viewer, then getting the configuration from the
viewer seems to be trivial ...
-mike