Changes

Summary

1. Deprecate UserFlag#SYSTEM and add User#isSystem (#1585) (commit: 54841e8) (details)

Commit 54841e8837234ddc756438f6540caca8891870cf by noreply Deprecate UserFlag#SYSTEM and add User#isSystem (#1585) (commit: 54841e8)
	src/main/java/net/dv8tion/jda/internal/entities/EntityBuilder.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/UserImpl.java (diff)
	src/main/java/net/dv8tion/jda/api/entities/User.java (diff)
	src/main/java/net/dv8tion/jda/internal/entities/UserById.java (diff)