Qt 5: handling of CSS imports in QtHelp

[agarny]

FWIW, I just came back to the above issue and found out what happened. Basically, the syntax changed (?) between Qt 4 and Qt 5. So, rather than having something like:

@import "/doc/res/common.css";

@import "/doc/res/common.css";

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We should now have:

@import "qthelp://namespace/virtualFolder/doc/res/common.css";

@import "qthelp://namespace/virtualFolder/doc/res/common.css";

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Now, I wish it had been documented somewhere...