Changes

• Fix a bug that ArUco detector didn't launch when aruco_map argument is false.
• Add dictionary parameter to aruco.launch.
• selfcheck.py: address situation when individual cells voltage is unknown.
• Blocks: allow using numbers in program names.
• Web topic viewer:
  • Support displaying multiline strings.
  • Add width and indent parameters.
• Add packages: vision_msgs, angles.
• Symlink assets instead of copying in documentation to save space.
• Various changes (full list).