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>

examples/driver_testing/include/driver.h

@@ -0,0 +1,11 @@
+
+#ifndef DRIVER
+#define DRIVER
+
+#include <stdint.h>
+
+void driver_write(uint8_t val);
+uint8_t driver_read();
+void driver_init_device();
+
+#endif /*include guard*/

examples/driver_testing/include/hardware_abstraction.h

@@ -0,0 +1,15 @@
+#ifndef HARDWARE_ABSTRACTION
+#define HARDWARE_ABSTRACTION
+
+#include <stdint.h>
+
+#ifndef TESTING
+#define IO_MEM_RD8(ADDR)  (*((volatile uint8_t *)(ADDR)))
+#define IO_MEM_WR8(ADDR, VAL_8)   (*((volatile uint8_t *)(ADDR)) = (VAL_8))
+#else
+/* In testing use fake functions to record calls to IO memory */
+uint8_t IO_MEM_RD8(uint32_t reg);
+void IO_MEM_WR8(uint32_t reg, uint8_t val);
+#endif
+
+#endif /* Include guard */

examples/driver_testing/include/registers.h

@@ -0,0 +1,13 @@
+#ifndef REGISTERS_H_
+#define REGISTERS_H_
+
+#define DRIVER_OUTPUT_REGISTER 0xFFAAu
+#define DRIVER_INPUT_REGISTER  0XFFABu
+#define DRIVER_PERIPHERAL_ENABLE_REG 0xFFACu
+#define DRIVER_PERIPHERAL_INITIALIZE_REG 0xFFACu
+
+#define HARDWARE_VERSION_REGISTER 0xFF00u
+#define HARDWARE_REV_A 0x00u
+#define HARDWARE_REV_B 0x01u
+
+#endif /* REGISTERS_H_ */