Migrate build to CMake and standard github workflows

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>

fakegen.rb

@@ -8,6 +8,10 @@ $MAX_ARGS = 20
 $DEFAULT_ARG_HISTORY = 50
 $MAX_CALL_HISTORY = 50
 
+def license
+  File.foreach("#{__dir__}/LICENSE") { |line| putd line }
+end
+
 def include_dependencies
   putd "#include <stdarg.h>"
   putd "#include <string.h> /* For memset and memcpy */"
@@ -636,6 +640,7 @@ def output_macro_counting_shortcuts(has_calling_conventions)
 end
 
 def output_c_and_cpp(has_calling_conventions)
+  license
   include_guard {
     include_dependencies
     output_constants