fix the adc trigger settings

added all examples to platformio

to keep platformio projects in sync with the examples folders, I added missing ones in alphabetical order.

Add warning message if WCH-LinkE is detected in ARM mode

Make top comment section match project.

Make it so minichlink will automatically try to get found if you have and have linked a ch32v003fun repository

Update with nulled printf (to prevent warnings on non-printf projects) and undestructively add interrupt nesting to WS2812B driver.

Fix for UART fractional BRR caclulation

 * Allow interrupt preemption in WS2812B driver.
 * Add simple driver for ws2812b's.

tim2_encoder example based on tim2_pwm_remap

Add #ifdef support for CH3/CH4 in tim2_pwm example

Avoid bricking CH32V003J4M6 - For #219

-Implement CH3 and CH4 optionally via #define
-By default only CH1 and CH2 are enabled.
-Channels 3 and 4 can be enabled by uncommenting the appropriate line
-Choose whether default of PWM pins is HIGH (0xff) or LOW (0x00)

NOTES:
-Channel 3 is on a different port (GPIOC) which will be enabled if
needed.

-Channel 4 is on the NRST pin so not usable unless you use `minichlink -d`
to disable the NRST function so the pin can be used as a GPIO

-If your board has a bypass capacitor on PD7 for a reset button the
waveforms observed on CH4 will not be nice square waves.

Uses partially remapped pins to read a rotary encoder (or any quadrature
input) using pins that should be 5V tolerant

Blink LED pin D6 as well (for MuseLabs nanoCH32V003 boards)