C++ Core: Add base class per sensor/actuator type

Adding base classes for UPM sensors and actuators.

Signed-off-by: Noel Eck <noel.eck@intel.com>

tests/unit/core/iUpmObject_tests.cxx

@@ -0,0 +1,55 @@
+#include "gtest/gtest.h"
+#include "iUpmObject.hpp"
+#include "iSensorType.hpp"
+
+class TestSensorClass : public virtual upm::iUpmObject
+{
+};
+
+/* Interfaces test fixture */
+class iUpmObject_unit : public ::testing::Test
+{
+    protected:
+        /* One-time setup logic if needed */
+        iUpmObject_unit()
+        {
+            /* Load a specific JSON library descriptor file */
+            obj.initFromJsonLibDesc("./sensortype_example.json");
+        }
+
+        /* One-time tear-down logic if needed */
+        virtual ~iUpmObject_unit() {}
+
+        /* Per-test setup logic if needed */
+        virtual void SetUp() {}
+
+        /* Per-test tear-down logic if needed */
+        virtual void TearDown() {}
+
+        /* Instance of the test class */
+        TestSensorClass obj;
+};
+
+TEST_F(iUpmObject_unit, test_json_basic)
+{
+    /* Basic checking */
+    ASSERT_EQ(obj.DerivedClassName(), "TestSensorClass");
+    ASSERT_EQ(obj.Description(), "This is a description");
+    ASSERT_EQ(obj.LibraryBaseName(), "core_tests");
+    ASSERT_EQ(obj.Name(), "TestSensorClass");
+}
+
+TEST_F(iUpmObject_unit, test_json_deserialize_basic)
+{
+    /* Basic checking */
+    ASSERT_EQ(obj.Name(), "TestSensorClass");
+    ASSERT_EQ(obj.Description(), "This is a description");
+}
+
+/* Currently no need for a custom main (use gtest's)
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}
+*/