These boards have an LED on D6

https://github.com/wuxx/nanoCH32V003

 * No more needing to decide between printf and UART in code.
 * Better debugprintf input
 * Unified code for all clock sources.
 * TINYVECTOR now saves like another 120 bytes of space.
 * None of the `Makefile`s except `bootloader` need anything extra
 * All configuration via `funconfig.h`
 * Sane defaults.
 * `SystemInit()` also initializes debugging (UART or SWIO depending on configuration)
 * Tunable timeout on debug printf.
 * Configurable UART baud rate.
 * `funconfig.h` is automatically included by `ch32v003fun.h`
 * Paves the way for other, non-003 processors.

* one GPIO library to rule them all

* GPIO example makefile transfer

* GPIO README.md video upload

* Update README.md

* Update README.md

* GPIO library path recitified

* GPIO pretty paths please

* platformio.ini removed GPIO_analogRead test

* GPIO removed implementation block (unused)

* restoring blink.bin #1

* restoring blink.bin #2

* GPIO_branchless added branching digitalWrite (sometimes necessary)

---------

Co-authored-by: recallmenot <edmund.raile@proton.me>

Added Windows speciffic lines to all example Makefiles (that didn't already have it) so they get the rigiht copy of libgcc.a. All examples now compile out of the box on Windows.

Cleanup some comments.

Add ability to use vendor commands with programmers.

* Blink now blinks D4 too
* Don't use compressed instructions by default.  Some compilers are old.
* Prevent double-halting on linke programmer.

Update build instructions on Windows to show how to use the off-the-internet build chains instead of WSL2.

Also fix 2 warnings.

Switch over to using a .c file instead of a .S file for the startup code.  Helps make order-of-compiling not matter.