Release 1.2.5 version bump

Release notes for 1.2.5:

New features

Implemented a new, more accurate Difficulty Predictor model trained on OST and RAID songs. by @Nytilde, @Brollyy in https://github.com/PKBeam/Edda/pull/110

Fixed the issue with incorrect format after trimming the cover image. by @Brollyy in https://github.com/PKBeam/Edda/pull/107
Fixed an issue where maps saved by in-game editor couldn't be re-opened in Edda. by @Brollyy in https://github.com/PKBeam/Edda/pull/108
Error while importing SM map into Edda by @Brollyy in https://github.com/PKBeam/Edda/pull/115
Cannot import SM map that's using MP3 audio file. by @Brollyy in https://github.com/PKBeam/Edda/pull/115
_lineLayer is not a required value for official maps by @Brollyy in https://github.com/PKBeam/Edda/pull/114