* change to use synchronize update vehicle state in pnc_map

* but print an error message for every 10 seconds, incase the user
really forget to provide prediction message

* script: record meta info into all bags.

* planning: add a gflag to protect nudge slowdown behavior.

* planning: reduce traffic light stop distance to 0.2 m

* planning: reduce minimum follow distance to 2m

* tools: set the default

(1)  Planning: improved the speed planning consistency by estimating speed limits with current speed. (2) bug fix in drivers. (#1913)

* Planning: improved the speed planning consistency by estimating speed limits with current speed.

* Drivers and Perception: bug fix.

* Planning: consider close obstacles.

line swing.

Planning: speed up BuildStBoundary by using GetProject with some hueristic range params, and using some tricks for early stop. (#1883)

Planning: shortened the minimum follow distance from 10 to 5 (meter) to avoid to slow response when waiting left turn.