add trim, and polish test_quotes of css_compress, again

An edge case that space at the beginning won't get removed.

polish test_quotes of css_compress

Now the testcase string should be clearer to read

Add test_escapedQuotes to css_compress

Thank you @micgro42!

Co-Authored-By: Michael Große <mic.grosse@googlemail.com>

css_compress: quote placeholder to simply quote protection

There are two ways of doing this:

1. "doku" > STR1 > "doku"
2. "doku" > "1" > "doku"

#1 is what I did before. I did replace STRN with a n

css_compress: quote placeholder to simply quote protection

There are two ways of doing this:

1. "doku" > STR1 > "doku"
2. "doku" > "1" > "doku"

#1 is what I did before. I did replace STRN with a new placeholder in the previous implementation so that there is no conflict. However #2 is more elegant, so this commit implements it.

Test is updated to address splitbrain's concern about placeholder string in the original text.

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add quotes test for #2517

don't treat double slashes as comments when used in string

This avoids treating double slashes as single line comments in CSS when
they are used in a filter or content string.

closes #638

added another test for fe5a50

That commit did not test what it actually made for. Handling protocol
relative URLs in CSS.

fix single line comments in CSS compression

double slashes in url() always have to be ignored

added (failing) test case for broken jquery ui compression

Added unit tests for CSS shorthand compression FS#2509

removed unecessary requiresin unit tests

moved _testing to _test