Marking log messages read

**What do you want to see?**
I'd like to be able to mark a log message as read so I can be sure that I've dealt with it. Maybe mark several at once or rules for ignoring repetitive messages, and a warning on end turn if there are any left unread.

**How would it help players?**
Help players keep track of what they need to do each turn. This would also be helpful if there were custom player set log messages that appear every turn or when certain conditions are true.

**Alternatives**
N/A

**Screenshots and mockups**
N/A

**Things to consider**
How to mark a message read? Select it? Double click it? Click a button next to it?