Refactoring, housekeeping, documentation

Add a class diagram. Still needs some details.
Refactor to better respect SOLID principles.
Housekeeping, move and rename classes/files.

app/src/sensor/SensorManager.cxx

@@ -0,0 +1,22 @@
+#include <sensor/SensorManager.h>
+
+using namespace std;
+
+SensorManager::SensorManager()
+    : mLMSensorsFacade(make_unique<LMSensorsFacade>()),
+      mGPUSensorsFacade(make_unique<GPUSensorsFacade>()) {}
+
+vector<shared_ptr<Sensor>> SensorManager::TemperatureSensors() {
+  vector<shared_ptr<Sensor>> tempSensors;
+
+  tempSensors = mLMSensorsFacade->TemperatureSensors();
+
+  auto gpuSensors = mGPUSensorsFacade->TemperatureSensors();
+  tempSensors.insert(tempSensors.end(), gpuSensors.begin(), gpuSensors.end());
+
+  return tempSensors;
+}
+
+vector<shared_ptr<Sensor>> SensorManager::RPMSensors() {
+  return mLMSensorsFacade->RPMSensors();
+}