Add the PT-P900Wc with a 560px printhead and 360dpi resolution, using the
P700 init sequence, PackBits raster, the print-information command and
precut support. Verified printing on 36mm laminated tape.
The existing 360dpi handling doubled the 180dpi tape widths, which is wrong
for wide tapes: the 180dpi values are clamped by those printers' 128-pin
printheads, not the true printable area. Add a separate px360 column with
Brother's documented print areas (36mm = 454px, confirmed on hardware; the
narrower widths are from the raster reference and untested) and clamp the
result to max_px so 360dpi printers with a narrower head (PT-9200DX) stay
safe.
Also add the udev uaccess rule for 2085.
The raster packet buffer was fixed at 64 bytes, but a full raster line is
max_px/8 bytes plus up to 4 header bytes. For printers with a printhead
wider than 480px this overflows the buffer and smashes the stack. No
previously supported printer was wide enough to trigger it (the widest,
PT-9200DX at 384px, needs 52 bytes), but a 560px printhead needs 74.
Size the buffer to 128 bytes, which is the maximum a single packet can be
since ptouch_send() caps transfers at 128 bytes.
