The API of `tsrb` was changed because of confusing type situations.
This API change takes this API change of changing `char` to `uint8_t`
up a level. Since `isrpipe` most often is used together with
`periph_uart` this change even is beneficial, as `periph_uart` also
uses `uint8_t` instead of `char`.
This defines a new 'isrpipe_read_timeout' module that should be used when using
the timeout based function of isrpipe.
This fix the implicit dependency to 'xtimer' that is only needed for the
'_timeout' functions.
It prevents 'stdio_uart' that uses 'isrpipe' to need to depend on xtimer.
This was silently solved at link time for most platforms but not for the
'esp32' for example.
'drivers/at' needed to be updated at the same time to follow the api change.
