Add Audio DAC example

Add an example for the MCO function

Better way to handle Windows linking to the right libgcc.a

Added Windows specific lines to all example Makefiles 

Add IRQ-driven operation and clocking to 800kHz

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.

Added README files to some examples

added a video via the online editor

Add I2C low-level and SSD1306 OLED graphics driver example

Merge branch 'master' of github.com:emeb/ch32v003fun

fix: "minichlink -u" segmentation fault

New example demonstrating use of TIM1 for 2 channel PWM output

fix platformio uartdemo environment