Function `state_change`

const fn state_change(state: State, byte: u8) -> (State, Action)

Transition to next State

Note: This does not directly support UTF-8.

If the data is validated as UTF-8 (e.g. str) or single-byte C1 control codes are unsupported, then treat Action::BeginUtf8 and Action::Execute for UTF-8 continuations as Action::Print.
If the data is not validated, then a UTF-8 state machine will need to be implemented on top, starting with Action::BeginUtf8.

Note: When State::Anywhere is returned, revert back to the prior state.