FileManager: introduce verbosity levels to optionally silence output

13 jobs for feature/filemanager-improvements in 6 minutes and 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed clang-c++11 #55579
Linux

00:02:38

passed cppcheck #55581
Linux

00:00:24

passed doc #55588
Linux

00:00:20

passed gcc-c++11 #55578
Linux

00:04:30

passed macos-c++11 #55580
Apple

00:01:32

passed VS2013-32-bit #55587
VS2013

00:00:56

passed VS2013-64-bit #55586
VS2013

00:00:59

passed VS2015-32-bit #55585
VS2015

00:01:21

passed VS2015-64-bit #55584
VS2015

00:01:09

passed VS2017-32-bit #55865
VS2017

00:01:18

passed VS2017-64-bit #55864
VS2015

00:01:40

failed VS2017-32-bit #55583
VS2017

00:00:08

failed VS2017-64-bit #55582
VS2015

00:00:12