* Cleaned up dependencies on controller manager
* Removed global fields
* Simplified setting up RascsiResponse and RascsiExecutor
* Got rid of remaining raw pointers
* Use references instead of pointers
* Improved encapsulation
* Using lambdas instead of member function pointers simplifies the command dispatching and reduces the code volume
* Removed duplicate error handling
* Fix for issue #956
* Unit test updates
* Resolved SonarQube issues
- Moved C++ code to cpp/ from src/raspberrypi
- Related updates to Makefile, easyinstall.sh, and the github build rules
- Removed the native X68k C code in src/x68k from the repo
