Openspades: Hotkey to view the chatlog

[marsmoon]

The chat area is very small and it's very easy to miss messages. There should be a hotkey that a user could hold to see a bigger chatlog. I propose key H or U as the default. Pressing esc and clicking a UI button is too distracting and takes too much time.

Also mentioned in: https://github.com/yvt/openspades/issues/544#issuecomment-272709088

[BR-]

Here's something:
https://github.com/BR-/openspades/commit/4911e94ae4151dd1f5602c8651d0adea7a072adb
https://github.com/BR-/openspades/commit/238c20cccd5475f917242c4219ae19a6ee986143

I'd like to add another hotkey to expand the ingame chat window, to see another 10 lines or so back without needing to stop playing to open the UI.

[feikname]

@BR- would you mind opening a pull request here for adding your hotkey modifications to OpenSpades? 😉