Presentation time analysis and automated building for windows

Release v1.4.0 with breakdown of presentation time

Also automatic building of releases for windows thanks to
Msys2/MinGW-w64 on appveyor, and of course documentation upgrade.

Gif support and other novelties

• Pympress now supports playing gif files that are embedded as movies, e.g. with \movie in the multimedia package for beamer.
• The highlight mode is now configurable just like the normal and notes on second screen modes, meaning we can see notes together with the current slide being highlighted.
• Czech translation (courtesy of @multiflexi )

Bugfix

Small patch to fix the estimated talk time bug #50

v1.1.1

Improve video support on two screens,

v1.1.0

Version bump & docs update

1.1.0 pre release

Includes a bug fix for python2, improving the log file mechanism and completing some translations.

1.1.0 pre release

Mainly a big refactor, some bug fixes linked to logging behaviour on Windows thanks to @r5r3

Configurable layout, emulated laser pointer, recent files menu, and more

Novelties:

• Possibility to rearrange layout in config file (see here for how the constraints on the json string's content: https://cimbali.github.io/pympress/options.html#layouts),
• ctrl + click now emulates a laser pointer on screen,
• various bug fixes,
• menu of recently opened files,
• any errors now are logged to a file named pympress.log in the current directory

Pre-rendering fix on windows

Should fix #18

Patch with bug fix for Mac OS X

Buf fixed on Mac OS X where pymprepss crashed due to trying non-portable things for translation. This is fixed now: translation works if python can find libintl.dylib and otherwise fails gracefully (i.e. no crash).
Thanks to @brianmay for reporting the bug and testing the fix.

Other novelty, a German translation, work of @FriedrichFroebel