add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

response on review

cleaning after better understanding of the surroundings

cleaning

fix tests on windows

Test to ensure less can parse the @import rewritten by css_loadfile()

This test is horrible, but I believe necessary to ensure that the
@import of less files actually works.

It is horrible as its n

Test to ensure less can parse the @import rewritten by css_loadfile()

This test is horrible, but I believe necessary to ensure that the
@import of less files actually works.

It is horrible as its not a unit test and its not a true functional
test. It probably implies the code in css_out() should be refactored
to make it easier to test intermediate results.

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