Changes

Summary

Commit e2b6fedbb26f20e2a8df35864b2430e67be41d73 by Austin Keener Read-only MessageActivity support. (#793) * Read-only MessageActivity support. * Removing unused code * Requested changes by Minn * Not failing message creation * consistency * requested changes * Update src/main/java/net/dv8tion/jda/core/entities/MessageActivity.java Co-Authored-By: Sanduhr32 <Maurice.Craft@t-online.de> * Update src/main/java/net/dv8tion/jda/core/entities/MessageActivity.java Co-Authored-By: Sanduhr32 <Maurice.Craft@t-online.de> (commit: e2b6fed)
The file was modified	src/main/java/net/dv8tion/jda/core/entities/Message.java (diff)
The file was modified	src/main/java/net/dv8tion/jda/core/entities/impl/SystemMessage.java (diff)
The file was modified	src/main/java/net/dv8tion/jda/core/entities/impl/ReceivedMessage.java (diff)
The file was added	src/main/java/net/dv8tion/jda/core/entities/MessageActivity.java
The file was modified	src/main/java/net/dv8tion/jda/core/entities/impl/DataMessage.java (diff)
The file was modified	src/main/java/net/dv8tion/jda/core/entities/EntityBuilder.java (diff)