[core] Including "none" as a composition type
[opf] add attrmetadata.compositionmetadata property
[opf] add attrmetadata.attributetype property
[opf] fix IsDirty of non external class attributes
[opf] implemented dispose operation
[tests] remove ignore of EJCoreOPFUnsupportedListOperations exception on console test
[opf] changing params of sql generation of class attributes from tclass to attrmetadata, in order to fix ambiguity