Follow image_transport conventions

[rgov]

• Update topic names in IFCB node to publish compressed images as /ifcb/image/compressed and /ifcb/roi/image/compressed respectively.

• Delete the custom image_transport_node and replace it with:

  <node pkg="image_transport" type="republish" name="image_republisher" args="compressed raw">
      <remap from="in" to="/ifcb/roi/image" />
      <remap from="out" to="/ifcb/roi/image" />
  </node>
  

• Declare appropriate dependency on image_transport in package.xml.

• Maybe update the rosbag exclusions pattern from /ifcb/image to /ifcb/image(/.*)?

• Maybe remap topics at the rosbridge node such that /ifcb/roi/image is remapped to /ifcb/roi/image/do_not_use. (The rtsp_camera remapping should probably also be done at the rosbridge node level.)