graphics/impressive: Update to 0.12.0
rP502255
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Description

graphics/impressive: Update to 0.12.0

Switch to MuPDF as default renderer for PDF files and give users the choice to choose alternate or additional PDF renderers (Ghostscript, Poppler and Xpdf)
Make further dependencies optional but leave them as default to keep in sync with upstream's defaults
Limit the port to Python 2.7 because Python 3 is not (yet) supported and add "python" to CATEGORIES to make searching somewhat easier
Introduce a patch to prevent possible runtime errors if graphics/py-pillow is updated to 6.0.0 [1] [2]
Pet portlint
Take maintainership

Notable changes since 0.11.1:

Many zoom mode related changes
Many video related changes
Made Impressive suitable for Raspberry Pi-based digital signage
Fixed --auto mode that was broken in 0.11.2 (only worked properly for the first page)
Fixed excessive mouse sensitivity in full-screen mode
Fixed crashes when clicking hyperlinks in some PDFs
Fixed non-working hyperlinks when more than one input document is specified
Added new MuPDF renderer, uses no temporary files or named pipes on POSIX with MuPDF >= 1.4
Can now use MuPDF's mutool instead of pdftk to get basic file information and unpack PDF files (for hyperlink decoding)
- pdftk is no longer required to open "modern" PDF files
- Only page title extraction still needs pdftk
Input files are now checked for playability (to prevent users from accidentally playing .info files)
Fixed non-responsiveness to any controls on slow systems where rendering a page takes longer than the --auto interval
First page is now shown as early as possible (before fonts etc. have been preloaded)
Fixed occasional re-rendering of pages that have already been rendered
Fixed 'keys' PageProp that was broken since 0.11.0
Fixed crash in --verbose mode
Changed shebang line to 'python2' to avoid issues with Linux distributions that use Python 3.x by default