Add ADC/DMA/Op-amp example

added font scaling to the i2c_oled example

GPIO example expanded by ADC functions, additional ADC example

added systick_irq_millis example

I2C example readme pins were swapped

cnlohr's separate putchar() for UART and Debug for speed.

added GPIO example

Add putchar() to fix linker errors when using printf on single character strings

Added option so Arch Linux will pull in zicsr support

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