Consistent image_transport support

[mikeferguson]

Some components support "image_transport" as a parameter that can be set to "raw", "compressed", etc - but many of them have "raw" hard coded.

Each node should also be checked for properly name spacing topics so that image_transport works as expected with remapping (example: #851)

depth_image_proc package

• convert_metric - depth_image_proc: consistent image_transport #900
• crop_foremost - depth_image_proc: consistent image_transport #900
• disparity - depth_image_proc: consistent image_transport #900
• point_cloud_xyz_radial - depth_image_proc: consistent image_transport #900
• point_cloud_xyz - depth_image_proc: consistent image_transport #900
• point_cloud_xyzi_radial - depth_image_proc: consistent image_transport #900
• point_cloud_xyzi - depth_image_proc: consistent image_transport #900
• point_cloud_xyzrgb_radial - depth_image_proc: consistent image_transport #900
• point_cloud_xyzrgb - depth_image_proc: consistent image_transport #900
• register - depth_image_proc: consistent image_transport #900

image_proc package

• crop_decimate - image_proc: consistent image_transport #884
• crop_non_zero - image_proc: consistent image_transport #884
• debayer - image_proc: consistent image_transport #884
• rectify - resize/recify: consistent image_transport #883
• resize - resize/recify: consistent image_transport #883

image_publisher package

• image_publisher - has no subscribers to configure

image_rotate package

• image_rotate - image_rotate: clean up #862 adds parameter and proper name resolution

image_view package

• disparity_view - subscribes to something that is not an image - so transport not supported
• extract_images - image_view: consistent image_transport #876
• image_saver - image_view: consistent image_transport #876
• image_view - already supports
• stereo_view - image_view: consistent image_transport #876
• video_recorder - image_view: consistent image_transport #876

stereo_image_proc package

• disparity - stereo_image_proc: consistent image_transport #903
• point_cloud_node - stereo_image_proc: consistent image_transport #903

[mikeferguson]

PRs are open for all of these packages