improve polyline_collection rendering: -single draw call -add colored draw modes

7 jobs for PolyLineCollection in 51 minutes and 12 seconds
Status Job ID Name Coverage
  Test
passed #19142
Apple
Mac-Cpp11

00:51:10

passed #19141
Qt551 VS2013
VS2013-Qt-5.5.1-x64

00:15:22

passed #19140
Qt56 VS2015
VS2015-Qt-5.6.0-x32

00:21:19

passed #19139
Qt56 VS2015
VS2015-Qt-5.6.0-x64

00:17:43

passed #19137
MultiThreads Linux
clang-c++11-Qt5

00:08:35

passed #19138
MultiThreads Linux
cppcheck

00:39:25

passed #19136
Linux
gcc-c++11-Qt5

00:04:00