Rename setTargetUrl to setTargetDirUrl
This change was initially meant to be part of D8785, but had been backed out due to concerns about breaking source compatibility. Meanwhile, in D8785#176817 it was determined that SC/BC most likely won't be an issue in Gwenview because of no other users of the code. Therefore we now can rename a couple of methods and variables to better reflect what they are about, improving readability.
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