GitLab

* reorganized CI files

* merged scripts into one

* refined macos tests

* hotfix

* use the same naming for env variables

* refined Travis tests

* refined VSTS Linux part

* cleanup

* added possibility to test Clang at VSTS

* simplified cp command

* Update .vsts-ci.yml

* Update test.sh

* fix bugs

* many fixes

* remove duplicate lines

* test for mingw

* Not nuget in appveyor

* remove mingw build

* Update test.sh

* Update test.sh

* Update test.sh

* fixed macOS wheel name

* don't run docs test at VSTS

* made nuget creating script directory independent

This reverts commit f0824da3.