More fixes for tab color handling with plugins

Part 2 of 03767ee0f9826222

So how the colors work should be pretty straight forward:

- A message comes in and is handled, this sets the state flags:
    nick_said, msg_said, new_data. These map to tab colors.
- This state is reset under one of these conditions:
  - It is commited to the UI when actually printed on unfocused tab
  - Event is interupted by a plugin hook
  - The tab focus is changed

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