Add Gst 10/12/14/16-bit support

[kohtala]

GStreamer 1.24 added support for more bit depths into bayer2rgb.

I only had Basler acA2440-20gc that implements BayerRG12. I tested on Testimage3 (for all pixel values) and Testimage6 (for correct colors) with command

gst-launch-1.0 -v aravissrc camera-name=192.168.0.20 ! video/x-bayer,format=rggb12le,framerate=1/1 ! \
  bayer2rgb ! video/x-raw,format=ARGB64_LE ! \
  videoconvert ! openjpegenc ! image/jp2 ! \
  filesink location=test-image-6.jp2

I also noticed a small potential leak in error path.

[EmmanuelP]

Thanks a lot. Just 2 minor things to fix.

[EmmanuelP]

Thanks for your investigation about g_strdup_printf. In the absence of a corresponding test in glib test suite, you are right it is better to take care to not send a NULL string parameter.

[EmmanuelP]

Thanks.