Adds getSubmodelElements to IVABElementContainer

Adds a function to IVABElementContainer to get all SubmodelElements
Adds SubmodelElementFacadeFactory to create the correct facade for each SubmodelElement

Change-Id: I0ed49849f213a9bfa30aa4e5a9ff0171ad6bd955
Signed-off-by: Maximilian Conradi <maximilian.conradi@iese.fraunhofer.de>
9 files changed