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/pwm/PWMControl.h

@@ -0,0 +1,40 @@
+#ifndef PWMCONTROL_H_
+#define PWMCONTROL_H_
+
+#include <boost/json/object.hpp>
+#include <string>
+
+#include <Printable.h>
+#include <Serializable.h>
+
+enum class PWM_CONTROL_PROPERTY { CONTROL, ENABLE, MODE };
+enum class PWM_ENABLE { FULL_SPEED = 0, MANUAL_CONTROL };
+enum class PWM_MODE { DC = 0, PWM };
+
+class PWMControl : public Printable, public Serializable {
+public:
+  PWMControl(std::string controlPath);
+  ~PWMControl();
+
+  void pwm(int percent);
+  int pwm();
+
+  void EnableManualControl();
+  void Reset();
+
+  const std::string toString() const override;
+
+  json toJson() const override;
+
+private:
+  int readValue(std::string path);
+
+  std::string mControlPath;
+  std::string mEnablePath;
+  std::string mModePath;
+
+  std::string mInitialEnable;
+  std::string mInitialMode;
+};
+
+#endif // PWMCONTROL_H_