Spectral selection cursor and mode selection changes from Paul Licameli.

This also now shows a new green 'play cursor' when ctrl is held down on wave track, and shift being held down is signalled by a cursor change to finger-pointer too.

I also accidentally enabled EXPERIMENTAL_MIDI_OUT.  We may disable that in December for release.  Leaving it in for now.

lib-src/mod-script-pipe/ScripterCallback.cpp

@@ -107,6 +107,7 @@ int SCRIPT_PIPE_DLL_API RegScriptServerFunc( tpExecScriptServerFunc pFn )
       pScriptServerFn = pFn;
       PipeServer();
    }
+
    return 4;
 }