Don't store a "you" reference in Message objects
Don't store a "you" reference in Message objects

Instead, "you" can be passed along with the constructor and is used only
during object constructionm. Cases where we would previously need to
refer to "you" are replaced with the singleton "null".

abhaymaniyar/zulip-android,saketkumar95/zulip-android,Sam1301/zulip-android,vishwesh3/zulip-android,saketkumar95/zulip-android,prati0100/zulip-android,prati0100/zulip-android,abhaymaniyar/zulip-android,zulip/zulip-android,Sam1301/zulip-android