STM32 platform

Information regarding general support for the STM32 can be found here: https://portgmbh.atlassian.net/wiki/spaces/IRJ45SOM/pages/201490466.

Specific information for small STM32 targets (G071RB, F103RB) can be found here: https://portgmbh.atlassian.net/wiki/spaces/IRJ45SOM/pages/176029729.

There is a full features GOAL based platform for STM32F429ZI with some information here: https://portgmbh.atlassian.net/wiki/spaces/IRJ45SOM/pages/222626056 .