Implemented chat message queue dumping on exit

[user12986714]

Implemented chat message queue dumping on exit. Upon restart, chat messages that were not posted in the last session will be restored.

[makyen]

In general, I'd appreciate more comments that explain what your intent is. In reviewing, I shouldn't need to dig through the code cold, having to figure out how what you are implementing is intended to accomplish your overall goal; nor should it be necessary to dig through each section of code or function in order to get a general overview of what is supposed to be happening. It doesn't take a lot of comments, but there should be some to guide the person reading the code as to what is intended to be happening, and in general how that's being accomplished.

[stale]

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