Support Stream Deck Module

[FlowingSPDG]

Hello. I made a Stream Deck Module series implemention based on official document.
Still WIP but I'll make it done quick(I think)

[FlowingSPDG]

Main commands are now implemented.

There are some missing commands that original did not have:

• 6 Keys
  • Get Firmware version(with options) - docs
  • Show Logo - docs
  • Set Idle Time Before Sleep Mode - docs
  • Update Boot Logo - docs
  • Get Idle time before entering Sleep Mode - docs
• 15/32 Keys
  • Get Firmware version(with options) - docs
  • Update Full Screen Image - docs (Basically same as Update Key Image, but different command id
  • Update Boot Logo - docs (same as above)
  • Update Background - docs (same as above)
  • Show Logo - docs (same as above)
  • Fill LCD with Color - docs (Implemented Fill Key with Color as set-rgb)
  • Set Idle time before entering Sleep Mode - docs
  • Get Idle time before entering Sleep Mode - docs
  • Get Unit Information - docs

I guess we can ignore these commands for now, or maybe implement them using different struct that implements StreamDeckHandler or something?

/// StreamDeck object
pub struct StreamDeck {
    kind: Kind,
    device: HidDevice,
}

// current implemention
pub trait StreamDeckHandler {
  pub fn connect(vid: u16, pid: u16, serial: Option<String>) -> Result<StreamDeck, Error>
  pub fn connect_with_hid(api: &HidApi, vid: u16, pid: u16, serial: Option<String>) -> Result<StreamDeck, Error>
  // ...
}

impl StreamDeckHandler for StreamDeckPlus {
  // impl same as before
}

// This implements StreamDeckHandler + additional Module commands...
pub trait StreamDeckModuleHandler: StreamDeckHandler  {
  pub fn get_unit_information(&mut self) -> Result<String, Error>
}

impl StreamDeckModuleHandler for StreamDeckModule6Keys {
  // impl original+module-expanded commands
}

[FlowingSPDG]

image::io::Reader is deprecated: https://docs.rs/image/latest/image/io/type.Reader.html

[FlowingSPDG]

refer to official document:
https://docs.elgato.com/streamdeck/hid/module-6#summary
https://docs.elgato.com/streamdeck/hid/module-15_32#summary

[FlowingSPDG]

Module series does not support reset command. However, maybe we could add "Cleanup" here:
https://docs.elgato.com/streamdeck/hid/module-6#closing-connection
https://docs.elgato.com/streamdeck/hid/module-6#show-logo
https://docs.elgato.com/streamdeck/hid/module-15_32#closing-connection
https://docs.elgato.com/streamdeck/hid/module-15_32#show-logo