LinGui: changes to resource preprocessor

LinGui:  changes to resource preprocessor
During the build, I was compiling tools for preprocessing and packaging
the gui description xml, preset defaults, widget dependencies, and icons.
The resulting resource_data.h file gets compiled into the binary.  These
tools are now implemented in python.  This eliminates the need to compile
the tools which caused complications when cross compiling.

This work was actually done many months ago.  But all the distributions
I wanted to support didn't have the libplist python module.  Now they all
do.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3382 b64f7644-9d1e-0410-96f1-a4d463321fa5