Trac: Support other ontologies for model interfacing

[MichaelClerx]

https://chaste.cs.ox.ac.uk/trac/ticket/2529

Pycml only supports the 'oxmeta' annotations at present.

As well as basic support (https://chaste.cs.ox.ac.uk/trac/ticket/1903), there are 2 issues that will need to be considered, arising from the fact that the names of simulation results use the local names of variable annotations, i.e. with the base URI for whatever ontology stripped out.

Conflicts could arise if 2 ontologies use the same local name.
Ontology terms with a colon in the local name will break name referencing/prefix delegation.

Both of these could perhaps most easily be resolved by a renaming clause in the output declaration in the model interface.

[MichaelClerx]

Will be handled as part of #199