Merge pull request #13 from ridoo/master

closes #12
Merge pull request #14 from ridoo/master

fix Sonar issues
Merge pull request #15 from ridoo/master

refinements on exception handling (fail fast)
Merge pull request #16 from ridoo/master

merge features
Merge pull request #17 from ridoo/master

cosmetics
Merge pull request #19 from ridoo/master

refinements in log handling
Merge pull request #20 from ridoo/master

update documentation
Merge pull request #24 from 52North/master

merge from master
adjust bar style rendering (without shadows and 3D)
rename constant
Merge pull request #25 from ridoo/master

adjust bar style rendering
closes #26
Merge pull request #27 from ridoo/master

closes #26
Merge pull request #28 from 52North/develop

align with current development