change FFI to use handles instead of jobjects, various fixes and extensions

...ngine/src/com/oracle/truffle/r/engine/interop/ListMR.java

...ruffle/r/engine/interop/RAbstractVectorAccessFactory.java

...com/oracle/truffle/r/ffi/impl/common/Generic_PkgInit.java

...oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java

.../com/oracle/truffle/r/ffi/impl/common/PkgInitUpCalls.java

...ruffle/r/ffi/impl/interop/pkginit/ForceSymbolsCallMR.java

...ruffle/r/ffi/impl/interop/pkginit/GetCCallableCallMR.java

...fle/r/ffi/impl/interop/pkginit/RegisterCCallableCall.java

...e/r/ffi/impl/interop/pkginit/RegisterCCallableCallMR.java

...ffle/r/ffi/impl/interop/pkginit/RegisterRoutinesCall.java

...le/r/ffi/impl/interop/pkginit/RegisterRoutinesCallMR.java

...le/r/ffi/impl/interop/pkginit/SetDotSymbolValuesCall.java

.../r/ffi/impl/interop/pkginit/SetDotSymbolValuesCallMR.java

...fle/r/ffi/impl/interop/pkginit/UseDynamicSymbolsCall.java

...e/r/ffi/impl/interop/pkginit/UseDynamicSymbolsCallMR.java

...com/oracle/truffle/r/ffi/impl/jni/JNIUpCallsRFFIImpl.java

...m/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_PkgInit.java

...truffle/r/ffi/impl/llvm/TruffleLLVM_RFFIContextState.java

...com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Tools.java

.../truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java