Qt5 multiple small fixes

* just assert palettes, which are larger then the bitmap support;
smaller then maximum palettes are ok
* 1bit images are encoded by the most significant bit (N1BitMsbPal)
=> adapt the alpha mask decoding
* drawLine update height and width need an additional pixel
* drawn objects can be filled *and* have an outline
* show cairo usage in about dialog

Change-Id: I301708386feb3cc1c86b27f47f0e76594a1e7357

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