rJava rewrite - initial commit

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPFactor.java

...e.truffle.r.pkgs/rJava/jri/REngine/REXPGenericVector.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPInteger.java

...e.truffle.r.pkgs/rJava/jri/REngine/REXPJavaReference.java

...oracle.truffle.r.pkgs/rJava/jri/REngine/REXPLanguage.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPList.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPLogical.java

...uffle.r.pkgs/rJava/jri/REngine/REXPMismatchException.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPNull.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPRaw.java

...racle.truffle.r.pkgs/rJava/jri/REngine/REXPReference.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPS4.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPString.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPSymbol.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPUnknown.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPVector.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REXPWrapper.java

com.oracle.truffle.r.pkgs/rJava/jri/REngine/REngine.java

...le.truffle.r.pkgs/rJava/jri/REngine/REngineCallbacks.java

...kgs/rJava/jri/REngine/REngineConsoleHistoryInterface.java