4.0.0

[TheSilentPro]

Contains all planned changes for 4.0.0

Source Code Changes

• Added support for Treasury.
• Added currency support in the config.
• Added HeadSubCommand for sub-commands.
• Added all sub-commands to their respective classes.
• Renamed HeadDatabase#updateAsync to HeadDatabase#update.
• Renamed HeadDatbase#getHeadsNoCacheAsync to HeadDatabase#getHeadsNoCache.
• Renamed CommandHeadDB to HeadDBCommand.
• Renamed HEconomyProvider to BasicEconomyProvider.
• Moved event classes to api/event.
• Moved database classes to implementation.
• Moved Head and LocalHead to implementation.
• HeadAPI will now use streams to filter results.
• Return unmodifiable list of HeadDatbase#getHeads(category).
• Payments are now handled asynchronously (Additionally, users will now receive a "purchasing..." message).
• Utils now has a async(task) method.

Other Changes

• The project will now follow Semantic Versioning.
• From now on new additions to the source code should be documented with the @since <version> tag.
• The project will most likely have a changelog starting from 4.0.0.