Allow using right pane for REPL output

[Dimagog]

Instead of showing web page in the right pane I'd like to have an option to show REPL output window there. Current REPL output window is too small (and not resizable).

Other nice-to-haves would be:

• Allow resizing current (small) REPL window
• Allow clearing REPL output
• Ctrl-A and Ctrl-C (select all and copy to clipboard) should work in REPL output window