layout improvements, connector change

pcb layout draft, incomplete

add footprint assignments

schematic: fix mezanine typo

schematic: update power and fix errors * specify separate 3V3 lines * remove bus symbols due to incorrect usage * pass ERC

schematic: add mezanine interfaces

schematic: add peripherals and io * add fmu peripherals * add sensor suite * add io module

schematic: add rp2040 pinout draft

gitignore: add auto saved files

Add standard libraries submodule