CRFFI: uses native memory backed vectors and handles attributes properly

...c/com/oracle/truffle/r/runtime/data/NativeDataAccess.java

...src/com/oracle/truffle/r/runtime/data/RComplexVector.java

...e/src/com/oracle/truffle/r/runtime/data/RDataFactory.java

.../src/com/oracle/truffle/r/runtime/data/RDoubleVector.java

...ime/src/com/oracle/truffle/r/runtime/data/RIntVector.java

...src/com/oracle/truffle/r/runtime/data/RLogicalVector.java

...ime/src/com/oracle/truffle/r/runtime/data/RRawVector.java

...untime/src/com/oracle/truffle/r/runtime/data/RVector.java

...r.runtime/src/com/oracle/truffle/r/runtime/ffi/CRFFI.java