Move HIDPowerDevice_::begin impl. to constructor

Proposal to simplify the implementation by avoiding the need for manually calling begin() before using HIDPowerDevice_.

Author: forderud

examples/UPS/UPS.ino

@@ -47,8 +47,6 @@ int iRes=0;
 void setup() {
 
   Serial.begin(57600);
-    
-  PowerDevice.begin();
 
   // Serial No is set in a special way as it forms Arduino port name
   PowerDevice.setSerial(STRING_SERIAL); 

src/HIDPowerDevice.cpp

@@ -226,15 +226,11 @@ HIDPowerDevice_::HIDPowerDevice_(void) {
     static HIDSubDescriptor node(_hidReportDescriptor, sizeof (_hidReportDescriptor));
 
     HID().AppendDescriptor(&node);
-}
 
-void HIDPowerDevice_::begin(void) {
     // set string ID here
-    
     HID().SetFeature(HID_PD_IPRODUCT, &bProduct, sizeof(bProduct));
     HID().SetFeature(HID_PD_SERIAL, &bSerial, sizeof(bSerial));
     HID().SetFeature(HID_PD_MANUFACTURER, &bManufacturer, sizeof(bManufacturer));
-    
 }
 
 void HIDPowerDevice_::setOutput(Serial_& out) {

src/HIDPowerDevice.h

@@ -102,7 +102,6 @@ class HIDPowerDevice_  {
 
 public:
   HIDPowerDevice_(void);
-  void begin(void);
 
   void setOutput(Serial_&);