NFI based Parse.c implementation

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

...src/com/oracle/truffle/r/ffi/impl/common/ParseResult.java

...oracle.truffle.r.native/fficall/src/common/rffi_upcalls.h

...racle.truffle.r.native/fficall/src/truffle_common/Parse.c

...fle.r.test.native/packages/testrffi/testrffi/R/testrffi.R

...uffle.r.test.native/packages/testrffi/testrffi/src/init.c

...e.r.test.native/packages/testrffi/testrffi/src/testrffi.c

...e.r.test.native/packages/testrffi/testrffi/src/testrffi.h

...est.native/packages/testrffi/testrffi/tests/simpleTests.R