Bundle of updates

I was planning on following the new format for the release announcements, but since almost every single app has the same changes, it would be quite repetitive. I updated basically every single program to have better installers on Windows and the Mac, and fixed the compile process to not have extra warnings during release builds.

The important thing is that I updated to Qt 5.11, and this means that FocusWriter should be able to save to Dropbox! I say should because the bug report is closed as fixed, but I don’t use Dropbox so I can’t test for myself. Enjoy!