Add "hidden" property to status.

9 jobs for status-hidden in 7 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #81077
VS2015
VS2015-32-bit

00:01:15

passed #81076
VS2015
VS2015-64-bit

00:01:27

passed #81075
VS2017
VS2017-32-bit

00:01:38

passed #81074
VS2015
VS2017-64-bit

00:01:23

passed #81071
Linux
clang-c++11

00:04:53

passed #81073
Linux
cppcheck

00:07:19

passed #81078
Linux
doc

00:00:12

passed #81070
Linux
gcc-c++11

00:04:53

passed #81072
Apple
macos-c++11

00:03:10