Changes

Summary

1. Make more use of CacheRestAction (#2158) (commit: 87b5fba) (details)

Commit 87b5fbaabaf51f89e38d654eb1d8a20a2bd6d585 by noreply Make more use of CacheRestAction (#2158) (commit: 87b5fba)
	src/main/java/net/dv8tion/jda/api/entities/ThreadChannel.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/ThreadChannelImpl.java (diff)
	src/main/java/net/dv8tion/jda/api/entities/Guild.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/GuildImpl.java (diff)
	src/main/java/net/dv8tion/jda/api/entities/User.java (diff)
	src/main/java/net/dv8tion/jda/internal/JDAImpl.java (diff)
	src/main/java/net/dv8tion/jda/api/JDA.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/UserImpl.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/SelfUserImpl.java (diff)