BREAKING CHANGES:
For developers :
A lot of effort has been put in making UltimateAdvancementAPI multi-version, so we took the opportunity to update the code to Java 16 and to make some changes.
Lombok has been removed from the project, and 'criteria' has been replaced with 'progression' in classes, fields, and methods names in order to make the API more intuitive to use.
Also, ENABLE_ARBITRARY_SET_PROGRESSION and DISABLE_EXCEPTION_ON_ARBITRARY_SET_PROGRESSION are now protected to improve code security.

For server admins: How to update
The column 'Criteria' of the 'Advancements' table in the database has been renamed to 'Progression', so it's necessary to run a manual command in order to update old databases. This doesn't apply if you install UltimateAdvancementAPI for the first time or delete the old database and create a new one.

Changelog:

• Updated to Java 16
• Added multi-version support: 1.15.x to 1.7.1
• Maven project has been restructured
• Commands now works with @a and @s selectors
• '/ultimateadvancementapi criteria ...' command has been renamed to '/ultimateadvancementapi progression ...'
• 'ultimateadvancementapi.criteria.*' permissions have been renamed to 'ultimateadvancementapi.progression.*'
• Lombok has been removed
• 'criteria' has been replaced with 'progression' in classes, fields, and methods names
  
• The column 'Criteria' into the 'Advancements' table in the database has been renamed to 'Progression'
• Added VALID_ADVANCEMENT_KEY, VALID_NAMESPACE, and VALID_KEY patterns to AdvancementKey
• MultiTasksAdvancement#ENABLE_ARBITRARY_SET_PROGRESSION and MultiTasksAdvancement#DISABLE_EXCEPTION_ON_ARBITRARY_SET_PROGRESSION are now protected
• Updated Libby to 1.1.3
• Minor fixes and improvements