put ConsoleHandler into separate file

...gine/src/com/oracle/truffle/r/engine/RContextFactory.java

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

...om/oracle/truffle/r/engine/shell/JLineConsoleHandler.java

...ngine/src/com/oracle/truffle/r/engine/shell/RCommand.java

...m/oracle/truffle/r/engine/shell/StringConsoleHandler.java

.../src/com/oracle/truffle/r/library/graphics/RGraphics.java

....library/src/com/oracle/truffle/r/library/utils/Menu.java

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Quit.java

...src/com/oracle/truffle/r/nodes/builtin/base/Readline.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Xtfrm.java

.../com/oracle/truffle/r/nodes/instrument/debug/Browser.java

...racle/truffle/r/nodes/instrument/debug/DebugHandling.java

...e/src/com/oracle/truffle/r/runtime/RRuntimeASTAccess.java

...fle.r.runtime/src/com/oracle/truffle/r/runtime/Utils.java

...src/com/oracle/truffle/r/runtime/conn/StdConnections.java

.../com/oracle/truffle/r/runtime/context/ConsoleHandler.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java

.../src/com/oracle/truffle/r/test/generate/FastRSession.java