Truffle/Debugging/REPL: major reorganization post-PolyglotEngine - Discarded language-specific specializations, with one temporary, minor exception - "loadr" and "loads" commands replaced by "load", which always "steps into" - added "call" command: it invokes an exported symbol, which is needed to run "main" in SL demo - fixed failures to propagate KillException and QuitException properly - fixed usability bug in the client: "load" now sets the "selected source" - add package-info.java

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