Resolve hsv-refactoring PR comments

[maxwellmlin]

See #80.

[viethungle-vt1401]

• Implement the missing functions in hsv_filter/hsv_lane_marker.py to match the functionality of lane_marker_detector.py.
• Make sure launch files in launch can launch these HSV scripts inside the hsv_filter subdirectory.
• Test these changes as part of prequal code.
• Implement other filters once competition handbook is released.
• Once each file has been migrated, delete the original detector script.

[AnthonZh]

hsv_filter/hsv_lane_marker.py should have the same functionality as lane_marker_detector.py: needs testing though. Avoiding deleting the original lane_marker_detector.py til hsv_lane_marker.py is fully implemented and tested. Testing locally, the hsv_lane_marker node launches nicely.