Updates for USBCDC and Others

What's Changed

• Always send full buffer on telnet connect. by @lbussy in #1
• Add support for USBCDC by @lbussy in #2
• Move to pio by @lbussy in #3
• Devel by @lbussy in #4

New Contributors

• @lbussy made their first contribution in #1

Full Changelog: https://github.com/lbussy/telnetspy/commits/1.4.2