Merge remote-tracking branch 'upstream/master'

updates the CM2 symbol with controller ports for easier reference

minor fixes to routing to several resistor pads

exchanges control module to CM2 as default control module

Merge branch 'master' of https://github.com/transistorgrab/OSSI

updates CM2 symbol, updates CM1 symbol, adds footprint for Control Modules

adds remark for resistor tolerances

adds a binary for initial operation tests blinks the two on-board LEDs, reads inputs for ADC1, reads temperature sensor, outputs 2 PWMs, outputs some text via UART (115200 bds).

adds image of 1V25_REF modification to errata

improves symbol desing to prevent confusion when reading schematics