* Start the process of using a global engine ptr for unit tests.
Passing around the engine, config, and persistent state wasn't buying anything. Instead, use
EngineTestHelper(Base) to correctly set and clear the global variables. Add a dummy check in
case some test tries to set them manually.
* Fix OSX build
* Adapt PR to recently added code.
* big pch energy
* put back ramdisk stub
* tests are happy
* h743 nucleo
* kinetis
* I love deleting code!
* make stepper happy
Co-authored-by: Matthew Kennedy <makenne@microsoft.com>