Copy tools dependencies

Each of XMVn tool needs its runtime dependencies available before it
can be ran.  Copy dependencies to build directory for further use.
Implement generic script for running tools

Running XMvn tools manually from command line is definitely possible,
but not trivial.  Shell scripts to run them are definitely useful.
Include tool scripts with dependencies in assembly
Copy only required files from Maven

Files like Maven's README.txt or a second copy of LICENSE.txt are not
needed and should be excluded from saaembly.