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This one has some magic inside to always use the current outputpane.
This solves the issue that I don't want Search and Build Issues list to
have its own set of next/prev shortcuts. todo is a better definition of
next for the build issues and/or a way to restrict it only to errors.

Removed "void" from functions that take no parameters, removed a few
"get" prefixes, etc.

Details:  We should stop all running runners, while the plugins are
still alive.

- drop prefix magic
- avoid inserting stray newlines

this also fixes the overquoting of app output.

Default shortcut is Ctrl+Shift+R now, but maybe there's something better
or more widely accepted. No menu entry yet.

Changing nothing, just preventing next patch to be scrambled by it.