Fixes several files incorrectly stated a different license from the actual project, as well as the copyright headers included in all files. This change has no effect on the licensing terms, it should clear up a bit of confusion by contributors. Plus the files get a bit smaller, and we have less duplicated information across the entire project.
Overall the project is GPLv2 if not built with Qt, and GPLv3 if it is built with Qt. There are no parts licensed under a different license, all have been adapted from other compatible licenses into GPLv2 or GPLv3.
* Fixed 'Pixelator's color transition point being off-center and uncontrollable.
* Fixed 'Drunk' filter not working at all.
* Added an inverted mode to 'Luma Burn'.
* Added exponential Luma to 'Luma Burn'.
* Fixed odd color behavior in the 'Color Shift' transition by switching out HSL with HSV.
* Added a new 'Sliding Bars' transition shader, for an example of it see this clip: https://clips.twitch.tv/RacyEndearingHorseradishAMPTropPunch .
