Now, if no event is received from the Pusher after MAX_EXTRAPOLATION_TIME, the
moving variable of the user is set to false.
So if a client does not send an update on time (for instance if the user switched
tab while walking), on the screen of others, the woka will appear to stop.
Turning the "importsNotUsedAsValues" TS config value to "error".
This will require us to use `import type` instead of `import` when we are importing a value that is only used as a type (and therefore that is dropped by the Typescript compiler).
Why this change?
This is a requirement to be able to use Svelte in the future. See https://github.com/sveltejs/svelte-preprocess/issues/206#issuecomment-663193798
