Add more round content safties

[Jacob-Griffin]

After a bit of a mess of a group test with 10 people, we need better checks to ensure that games are currently in sync. Notably, the client can miss firebase events for internet reasons or not being tabbed in, which can mess up whole stacks. There should be a few more opportunities to do a quick check of the firebase, such as tabbing back in or a second or two after time lapses.

[Jacob-Griffin]

Other stability things:

• Images should not be uploaded when the round input is even
• Empty text should not go in for images, which somehow happened on stack Jacob round 5 in 337434

[Jacob-Griffin]

Coming back to this after some space, it seems what I've implemented is:

• On window becoming visible again, manually checks the firebase status to resync/move on
• On the timer hitting 0, it sends the forced submit event once, and becomes ineligible for double submissions until the timer goes above 0 again
• If somehow a forced submission was double sent anyway, it will deny the second send if it was in a shorter interval than minimum round length (~5 seconds)
• Submissions hard check the data type now. If it is the incorrect type, it will deny the submission. If this submission was forced, it instead grabs the default of a type.

These should be enough to stabilize, I think, so it should be worth another test at some point

[Jacob-Griffin]

Things seem to be fixed in regards to getting the new content in. Things are not fixed in regards to people all moving on together. I think this issue is fixed, and #44 is all that remains, but I'll leave it open and keep an eye on this one until it's all smooth

[Jacob-Griffin]

We've had 3 successful games with no drops or timing or reload issues, so I think we're good to close this