FEAT: relaxed parens expression usage, they can be used as standalone expressions (not nested).

This is experimental, I can't generate any error allowing this. If an issue appears, the restriction will be applied again.
FIX: multiple fixes for ?? function.
FIX: missing local definition in collect-deep. Fixes a crash in GTK-text-editor.red.
FEAT: improved debug printing of words in interpreter.
FEAT: added error messages for EXIT/RETURN if used from the interpreter (not yet implemented).
FIX: improved console line endings support for non-Windows platforms.
FIX: Q short-cut put back (when in console only).
FIX: minor console code cleanups.
FIX: unset words corrupt stack in nested expressions, when run from interpreter.