Adding more hid-io commands

- h0016 - Flash Mode
- h0017 - UTF-8 String
- h0018 - UTF-8 State
- h001a - Sleep Mode
- h0031 - Terminal Command
- h0034 - Terminal Output

Includes some branch merge fixes as well

Author: haata

examples/watchnodes.rs

@@ -24,7 +24,7 @@ use futures::{AsyncReadExt, FutureExt};
 use hid_io_core::common_capnp::NodeType;
 use hid_io_core::hidio_capnp::hid_io;
 use hid_io_core::hidio_capnp::hid_io_server;
-use hid_io_core::protocol::hidio::HidIoCommandID;
+use hid_io_protocol::HidIoCommandID;
 use rand::Rng;
 use std::collections::HashMap;
 use std::convert::TryFrom;