v2.13.0-pre.12

• #394 Added target "ReaLearn: Take mapping snapshot"
• #394 Improved target "ReaLearn: Load mapping snapshot" to be able to load manually taken mapping snapshots and set default values
• #619 Improved error reporting if session could not be restored (now logs session JSON)
• #619 Fixed backward compatibility to some old presets that use JSON null instead of omitting properties
• #606 Fixed BorrowError when having more than one instance and loading < 1.12.0 projects or presets
• Fixed shining through "Up" label in macOS dark mode