Send IMDN to sender on a one-to-one chatroom with the same parameter as

Merged Andrea Gianarda requested to merge fix/imdn_basic_chatroom_master into master

the one the message was for. For an unencrypted group chatroom, IMDN will be sent to a one-to-one conference based chatroom so that aggregation is not an issue

Assign mPreviousState in Account class

liblinphone!3599 (merged) https://linphone.atlassian.net/browse/SDK-581

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