Add lock checks for rest of methods and fix usage of Promise polyfill (#992)

[hansagames]

Fix me if I am wrong but I think that all methods should be added to the queue if promise is not resolved yet. Also added extra check to fix usage of non native Promises.

Please review @goldfire and @dmednis as you made initial lock fix

[dmednis]

I would probably rename the lock variable to something more generic since it now also locks the rest of the functions. But otherwise seems legit. 👍

[goldfire]

Huh, that is really odd. I'm using the same version of Chrome and macOS as you, but the play instanceof Promise check works for me (and thus the error doesn't happen). It seems like the promise change is the main thing needed, but I'm sure there are edge-cases that the lock would fix. Since the lock is still only waiting for the play call, I think that name still works fine.