Forwardporting "Replace AST-Access by Symbol-Access for hasCardinality()" (#84)

[justusrm]

Changed

• When resolving for adapted variables, ports may have a cardinality and thus be of array type. Previously, the check for cardinalities relied on the AST, which breaks if the symbol is loaded from a serialized symbol table. This change replaces the access to the AST with a newly introduced field on the symbol (and also adds the symbol table completer). This is a forward port from 7.8.30 Extending PortUsageSymbol by hasCardinality flag #84