* add type definition and utility for lane post-processing

* add connected component analysis code

* fix bug in type.h for lane post-processing

* modify name of 'connected_components.cc' to 'connected_component.cc'

* merge conflict

* Perception: fix bugs in connected component analysis

* add cc_lane_post_processor

* modify object names in lane_post_process/common

* fix bugs and coding style issues

* delete commented code in 'lane_frame.cc'