Refactor lane_detector pkg

[dragonfly91]

• Separate debugger node to display the final image. All the intermediate images should be displayed only under debug flag.
• Remove individual FPS checks. Keep only one for the whole pipeline and keep it under debug flag
• Move common params to eklavya_launchers launch files
• Express the constants in inversePerspectiveTransform.cpp in terms of map_size instead of hard coding them
• Use hierarchy to order window names in the interior files (low priority ~ post IGVC)
• Move all important remaining params outside to the module.launch
• Rename old lane_detector pkg to color_based_lane_detector. Rename this one to lane_detector

[dragonfly91]

@krishna95 please mark all those that are done...