Replace makefiles with CMakeLists.txt. This will allow for IDE and
platform agnostic builds of FFF.
Update the CI for FFF to use github workflows which don't depend on MS VC.
The workflow added will verify the pull requests sent to master buy
running 'buildandtest' which mirrors the developer workflow.
Signed-off-by: Yuval Peress <peress@google.com>
Added the use of the $(MAKE) variable to support 'gnumake'.
Fixed an issue with some make compile rule and the -o option.
All targets are removed from the build directory when running 'make clean'.
