Client chat: Message limit

[Qaomen]

Description
Currently the client chat contains all messages it has received since the start. To keep the list of messages easier to navigate and save on memory, the total amount of messages should be limited to a certain amount, removing the top-most/oldest whenever it goes over the limit.

Minimum Acceptance Criteria

• When the maximum amount of chat messages has been reached, the oldest message should be removed when a new one is received.
• The maximum amount of chat messages should be configurable.

Is blocked by the following issues
Related to #292 for message removal.