debug_server: build a new debug window

Use radio buttons laid out vertically so that locales with long labels
(no short word for "write core file") can still look nice. This is open
for experiment,

debug_server: build a new debug window

Use radio buttons laid out vertically so that locales with long labels
(no short word for "write core file") can still look nice. This is open
for experiment, buttons laid out vertically are another option. At least
now we have a window t work from, as BAlert doesn't cut it here.

While I'm at it, use a ladybug icon for this one, so it's visibly
different from normal application alerts.

Change-Id: I08ba9573f132901484224e107404348e7dca97f4
Reviewed-on: https://review.haiku-os.org/c/1459
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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