Moved hot key handling and clipboard impl to crossterm.

[Jisu-Woniu]

Closes #94.

However, this brings more dependencies and is expected to longer compilation time.

The buggy read_key impl in console will keep the terminal in raw mode, where subsequent commands in shell won't see echo.

What's more, Ctrl+C used by tokio is tricky on Windows, so I am not aware how to trigger that correctly in new clipboard handling block.

[Jisu-Woniu]

I need someone with Windows device to test whether Ctrl+C will quit the default compiled program, thanks!

You need to:

• Install the version compiled from my fork

  # On a windows device: (need --force if sendme is already in .cargo/bin)
  cargo install --git https://github.com/Jisu-Woniu/sendme.git

• Run sendme send <SOME-RANDOM-FILE>
• After the program says press c to copy command to clipboard ..., press Ctrl+C.
• Ensure the program exit correctly, and the terminal behaves correctly when running echo Hello or something like that.
• If anything went wrong during that, notice me

[Jisu-Woniu]

Having tested it on my friend's Windows 10 PC with Windows Terminal. The above process works as expected.

[robertkirkman]

I have tested building and running this PR for Termux (Android) and I can confirm that it also prevents the problem of terminal output breaking after pushing Ctrl + C to stop sending on Termux.

[rklaehn]

So how do I reproduce this with the original sendme? Run it on windows and then hit control-c? Ah, never mind. It is in the issue.

[Jisu-Woniu]

Windows may or may not be affected by the original issue, I just want to check if the PR works on Windows. Never mind, I have tested it on my friend's Windows 10 PC.

[dignifiedquire]

thanks