macosx: Improve horizontal resizing behaviour in simple prefs
Layout popups / etc. in such a way that they increase size in case of horizontal resize. For labels, make sure: - set single line mode to true, truncate - set compression resistency to 750, so they do not get truncated - set hugging priority to 251, so that popups get expanded, not labels - With that, fixes some build warnings for functionality before 10.11 Also, set maximum frame size to current frame size. This should disallow excessive horizontal resizes, whereas vertical resizes are still ok. Set better background color for scroll view.
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