chore: add `-Wno-unused-parameter` by default
fix: add the header for `NULL` to pubsub
style: add extra blank lines
feat: add node abstraction
feat: runner of nodes
wip: implement i2c
wip: support for adxl345
wip: support for l3g4200d
wip: support for hmc5883l
wip: support for bmp085
style: fix punctuation
wip: adapt ahrs madgwick filter
wip: ahrs node
feat: implement ahrs based on gy-80