event: Decouple user input checks from `event_poll`

This was done to generalize the usage of `event_poll`, which will now return
`true` only if a event has been processed/deferred before the timeout(if not
-1).

To do that, the `input_ready` calls have been extracted to the input.c
module(the `event_poll` call has been surrounded by `input_ready` calls,
resulting in the same behavior).

The `input_start`/`input_stop` calls still present in `event_poll` are
temporary: When the API becomes the only way to read user input, it will no
longer be necessary to start/stop the input stream.

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