Adding more precise scan separation feature#285

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n-patiphon wants to merge 3 commits intoros-drivers:masterfrom MapIV:feature/precise_scan_separation

+143-5

Commits on Aug 26, 2019

Added the number of Velodyne of packets in each scan before unpacking
n-patiphon
committed
Added new scan separation for VLP16 and VLP16-Hires
n-patiphon
committed

Commits on Aug 28, 2019

Fixed linting errors
n-patiphon
committed