Nik Clayton 96bf38f272 Add a new ioctl to syscons, CONS_SCRSHOT. Given a userland buffer, it
copies out the current contents of the video buffer for a syscons terminal,
providing a snapshot of the text and attributes.

Based heavily on work originally submitted by Joel Holveck <joelh@gnu.org>
for 2.2.x almost 30 months ago, which I cleaned up a little, and forward
ported to -current.

See also the usr.bin/scrshot utility.
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