Changes

Summary

1. Added a `CategoryOrderAction`, documentation, and access points (#578) (commit: 43035db) (details)

Commit 43035db0c46b28381144e4372533b4af69ccecd0 by Florian Spieß Added a `CategoryOrderAction`, documentation, and access points (#578) (commit: 43035db)
	src/main/java/net/dv8tion/jda/core/entities/impl/CategoryImpl.java (diff)
	src/main/java/net/dv8tion/jda/core/requests/restaction/order/ChannelOrderAction.java (diff)
	src/main/java/net/dv8tion/jda/core/requests/restaction/order/package-info.java (diff)
	src/main/java/net/dv8tion/jda/core/entities/Category.java (diff)
	src/main/java/net/dv8tion/jda/core/requests/restaction/order/CategoryOrderAction.java
	src/main/java/net/dv8tion/jda/core/managers/GuildController.java (diff)