LiveData: Initial implementation

Add support for live data subscription via Device::subscribeLiveData() and
Device::unsubscribeLiveData(). The live data API can be used to subscribe to
individual "signals", a full list of which can be found in LiveDataValueType.

communication/livedata.cpp

@@ -0,0 +1,22 @@
+#include "icsneo/communication/livedata.h"
+namespace icsneo {
+
+namespace LiveDataUtil {
+
+LiveDataHandle getNewHandle() {
+	static LiveDataHandle currentHandle = 0;
+	++currentHandle;
+	if(currentHandle == std::numeric_limits<LiveDataHandle>::max()) {
+		EventManager::GetInstance().add(APIEvent::Type::LiveDataInvalidHandle, APIEvent::Severity::Error);
+		currentHandle = 1;
+	}
+	return currentHandle;
+}
+
+double liveDataValueToDouble(const LiveDataValue& val) {
+	constexpr double liveDataFixedPointToDouble = 0.00000000023283064365386962890625;
+	return val.value * liveDataFixedPointToDouble; 
+} 
+
+} // namespace LiveDataUtil
+} // namespace icsneo