Differentiate between LED-Device Enable/Disable and Switch On/Off (#960)

* Switch Off devices, when no input source

* Realign Enable/SwitchOn, Disable/SwitchOff

* Align to updated LedDevice-Flow

* Remove debug statements slipped in

* Send last color update after enabling again

* Fix WLED getProperties API call

* Remove unused signals

* LedDevice process flow documentation

* LedDevice process flow documentation

Co-authored-by: Paulchen Panther <16664240+Paulchen-Panther@users.noreply.github.com>

include/hyperion/PriorityMuxer.h

@@ -109,6 +109,13 @@ public:
 	///
 	int getCurrentPriority() const { return _currentPriority; }
 
+	///
+	/// Returns the previous priority before current priority
+	///
+	/// @return The previous priority
+	///
+	int getPreviousPriority() const { return _previousPriority; }
+
 	///
 	/// Returns the state (enabled/disabled) of a specific priority channel
 	/// @param priority The priority channel
@@ -193,13 +200,6 @@ signals:
 	///
 	void timeRunner();
 
-	///
-	/// @brief A priority has been added (registerInput()) or deleted, method clear or timeout clear
-	/// @param priority  The priority which has changed
-	/// @param state     If true it was added else it was removed!
-	///
-	void priorityChanged(quint8 priority, bool state);
-
 	///
 	/// @brief Emits whenever the visible priority has changed
 	/// @param  priority  The new visible priority
@@ -261,6 +261,9 @@ private:
 	/// The current priority (lowest value in _activeInputs)
 	int _currentPriority;
 
+	/// The previous priority before current priority
+	int _previousPriority;
+
 	/// The manual select priority set with setPriority
 	int _manualSelectedPriority;