teensy-core-4.1

Teensy 4.1 core updated for C++20

David Hedin 5c064702ba Add define guards to allow compiler flags to change product name/serial number		8 lat temu
..
core_id.h	Initial commit, version 1.17-rc1	11 lat temu
usb.c	Fix compiler warnings	10 lat temu
usb_api.cpp	Add availableForWrite() on Teensy 2.0	10 lat temu
usb_api.h	Add availableForWrite() on Teensy 2.0	10 lat temu
usb_private.h	Add define guards to allow compiler flags to change product name/serial number	8 lat temu