restructured test folder and enabled cmake v3 support

unittest/internal/CMakeLists.txt

@@ -0,0 +1,7 @@
+target_sources(${TARGET_NAME} PRIVATE
+	InternalUnitTester.cpp
+	UnittDefinitions.cpp
+)
+
+add_subdirectory(osal)
+add_subdirectory(serialize)

unittest/internal/osal/CMakeLists.txt

@@ -0,0 +1,5 @@
+target_sources(${TARGET_NAME} PRIVATE
+	IntTestMq.cpp
+	IntTestMutex.cpp
+	IntTestSemaphore.cpp
+)

unittest/internal/serialize/CMakeLists.txt

@@ -0,0 +1,3 @@
+target_sources(${TARGET_NAME} PRIVATE
+	IntTestSerialization.cpp
+)