v0.18.0

• enhancement: the new option Environment variables allows to modify the environment variables seen by the test executables without modifying the system's global environment. Variables are provided by means of key-value pairs Foo=Bar, and are separated by //||// (#302)
• enhancement: added some debug output to make working with settings helper files easier (#278)
• bugfix: if the last variable's value of a settings helper file was followed by a line break, that line break would be added to the value (#306)
• maintenance: fixed some deprecation warnings in NuGet specification (#264)