Thanks to @lclc98 we worked around a bug in Qt<5.9 and made KShare work on weird multi monitor configurations where they for example overlap, also screens are now in proper positions despite what order they are in xrandr, for example.
Thanks again to @lclc98!
Added a functionality of uploading byte arrays and even files. Created RecordingFormat, which allows me to create states, I guess??, for RecordingContex's. Needed for, eg. gifs, which are horrible and I strongly suggest against, which will actually be stored as files per frame which are QImages encoded with QImage::Format_RGB888 (confirmation needed).