otr: #2713 fixed: OTR notifications are always visible as system messages

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
sms: #2675 fixed: new code for T-Mobile gateway

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
history: #2672 fixed: crash in history

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gui: #2742 fixed: crash when closing chat widget

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>