better pinning/archiving/import_game etc

[michaeljb]

• could look at most recent action in active game and pin instead of archive if the action is recent enough (say, last 3 days)
• script to archive all games with status: finished and a pin, possibly over X days old
• allow import_game to import from a game json file, possibly useful for importing into prod
• script to remove pin files if no game is pinned to them
• maybe on deploy, also always create pin file and put it in public/pinned (many of these ideas could be put in deploy script)
• by default, pin a game to the latest pin file -- so if you manually pin before deploying, you don't need to specify the pin; on deploy, if the latest pin was unused it can be cleaned up and replaced with the current pin
• whole list of all ids could be given, script could figure out if they should actually be pinned or archived

[michaeljb]

queue.rb:

• after 90? 30? 7? days archive pinned games that are finished
• after doing that, delete any unused pin files