Refactoring, housekeeping, documentation

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

app/include/sensor/SensorManager.h

@@ -0,0 +1,20 @@
+#ifndef SENSORMANAGER_H_
+#define SENSORMANAGER_H_
+
+#include <memory>
+#include <sensor/GPUSensorsFacade.h>
+#include <sensor/LMSensorsFacade.h>
+
+class SensorManager {
+public:
+  SensorManager();
+
+  std::vector<std::shared_ptr<Sensor>> TemperatureSensors();
+  std::vector<std::shared_ptr<Sensor>> RPMSensors();
+
+private:
+  std::unique_ptr<LMSensorsFacade> mLMSensorsFacade;
+  std::unique_ptr<GPUSensorsFacade> mGPUSensorsFacade;
+};
+
+#endif // SENSORMANAGER_H_