[Feature] Update library documentation (#580)

* Minor IHardware doc fixes

* Add XML with documentation to NuGet and output

* Update Software namespace docs

* Update some internal classes

* Update main Computer class docs

* Update interfaces docs

* Update Computer class documentation

* Update motherboard docs

* Update hardware docs

* Fix code formatting

* Update SensorVisitor handler doc

LibreHardwareMonitorLib/Hardware/IVisitor.cs

@@ -11,12 +11,28 @@ namespace LibreHardwareMonitor.Hardware
     /// </summary>
     public interface IVisitor
     {
+        /// <summary>
+        /// Refreshes the values of all <see cref="ISensor"/> in all <see cref="IHardware"/> on selected <see cref="IComputer"/>.
+        /// </summary>
+        /// <param name="computer">Instance of the computer to be revisited.</param>
         void VisitComputer(IComputer computer);
 
+        /// <summary>
+        /// Refreshes the values of all <see cref="ISensor"/> on selected <see cref="IHardware"/>.
+        /// </summary>
+        /// <param name="hardware">Instance of the hardware to be revisited.</param>
         void VisitHardware(IHardware hardware);
 
+        /// <summary>
+        /// Refreshes the values on selected <see cref="ISensor"/>.
+        /// </summary>
+        /// <param name="sensor">Instance of the sensor to be revisited.</param>
         void VisitSensor(ISensor sensor);
 
+        /// <summary>
+        /// Refreshes the values on selected <see cref="IParameter"/>.
+        /// </summary>
+        /// <param name="parameter">Instance of the parameter to be revisited.</param>
         void VisitParameter(IParameter parameter);
     }
 }