fix compilation for arch linux

on arch linux, the risc compiler name is different.
Add some logic to pick correct risc compiler on arch linux

Signed-off-by: Amitesh Singh <singh.amitesh@gmail.com>

Fix comment

Add `-fdata-sections` to compile flags

Add Arduino-like GPIO, after it was discovered that this is no worse and paradoxically marginally better than the raw access.

Fix typo preventing specpgm hint from being read on cmdline

added __isenabled_irq __get_cpu_sp, minor linting

examples/direct gpio: remove count variable

count variable does not do anything

Signed-off-by: Amitesh Singh <singh.amitesh@gmail.com>

Add MAX7219 SPI display driver library + example and small SPI library fixes

Added ST77xx color LCD example

SPI lib: fixed bugs discovered by JKT

Update standby examples and add implementation notes.

fix the adc trigger settings