Provide console page for "stdout" output

[fsteeg]

Output of Flux workflows that write to "stdout" using a write("stdout") pipe element is printed to the console of the Eclipse process when executed with the Metafacture IDE launcher.

We should provide a console page to hook into the Console view and redirect output there.

[cboehme]

+1 this would be really helpful, not only for write("stdout") but also for log messages. I tend to use console output a lot to quickly check if a script does what I expect it to do.