* Fixed gzip automatic content-type assignment and added automatic compression setting
This implements the fix for detecting the proper content-type even when the file has the ".gz" extension. It further makes sure the compression headers are set properly if a "gz." file is detected, but the compression headers weren't explicitly set by the user.
* Added a test for properly auto-determining mime types and setting content encoding header
* Modified the gzip file header assignments and following tests according to the feedback.
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Co-authored-by: Lukáš Kremla <lukas.kremla@bonnel.cz>
