Prefix the unzipped OMERO.matlab toolbox with version number

The release-clients target used to directly copy the zip file generated by the
release-zip target under components/tools/OmeroM/build.xml. This caused the
unzipped OMERO.matlab toolbox to lose its version number. This commit fixes
this by re-zipping the Matlab target components with a versioned prefix in
release-clients.

To test this PR:
- download the OMERO.matlab artifact from the latest merge build
- unzip it using either a graphical application or command-line using `unzip`
- make sure the unzipped folder contains the version number in both cases
- check all components are included (comparing it with the latest released toolbox for instance)