Adds SideCompoundHandler interface and first implementation.
Adds side compound awareness to the participant interface and imp.
Adds side compound annotation functionality to the SBMLIOUtil class, to grab this information from the participants of reactions.
Merge branch 'develop' into feature/sideCompounds
Merge branch 'develop' into feature/sideCompounds
Adds side compound handler as optional injection.
Merge branch 'develop' into feature/sideCompounds
Merge branch 'feature/sideCompounds' into develop