Update MATLAB examples for 5.0.x

In preparation of Paris 2014 workshops, this PR reviews the MATLAB training examples for OMERO. Major changes in this PR include:

- refactoring of the parameter parsing logic (for the daily CI jobs)
- unification of the connection log message
- "breaking" change, MATLAB examples now parse object ids from the config files stored as properties with key `omero.imageid`, `omero.datasetid`... Relevant modifications will be brougth to the CI job.
- `ConnectOMERO.m`: creation/deletion of an unsecure client as part of the example
- `ReadDataAdvanced.m`: complete review to make a better use of the toolbox functions
- `Filesets.m`: new example script providing examples on how to use Filesets in 5.0.x, see also `examples/Training/python/Filesets.py`
- `ReadData.m`: usage of `false` flag to rerieve unloaded projects/datasets via `getProjects/getDatasets`

/cc @jburel @bramalingam @imunro @mporter-gre