Initial integration of hid-io-protocol into hid-io-core

- Removes protocol/hidio in favour of hid-io-protocol
- Uses fixed sized buffers
  * Allows testing embedded and host versions with same/similar
  code-base
- Large cleanup of hid-io-protocol
  * Removed unnecessary byte buffer code and added it to
  CommandImplementation instead
  * Remove duplicate functionality (now that byte buffer is no longer in
  Commands)
  * Changed send_buffer to tx_packet_buffer_send which automatically
  handles the serialization buffer (simplifies buffer creation)
  * Using a single serialization buffer instead of using each stack
  (test case CommandInterface)
  * Removed as many ArrayLength hardcodings as possible

Author: haata

Cargo.toml

@@ -98,6 +98,7 @@ flexi_logger    = "^0.16"
 futures         = { version = "^0.3", optional = true }
 futures-util    = { version = "^0.3", optional = true }
 glob            = { version = "^0.3", optional = true }
+heapless        = { version = "^0.5" }
 hidapi          = { version = "1.2.4", default-features = false, features = ["linux-static-hidraw"], optional = true }
 hid-io-protocol = { path = "hid-io-protocol" }
 libc            = { version = "^0.2", optional = true }