Upgrade Doxygen configuration files for Doxygen 1.8.1, fix broken stylesheet and footer HTML, add explicit spacing into documentation code fragments to prevent Doxygen from removing empty lines in the output.

LUFA/Drivers/USB/Core/ConfigDescriptor.h

@@ -76,7 +76,7 @@
 			 *  uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
 			 *  USB_Descriptor_Configuration_Header_t* ConfigHeaderPtr = DESCRIPTOR_PCAST(CurrDescriptor,
 			 *                                                           USB_Descriptor_Configuration_Header_t);
-			 *
+			 *  
 			 *  // Can now access elements of the configuration header struct using the -> indirection operator
 			 *  \endcode
 			 */
@@ -90,7 +90,7 @@
 			 *  uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
 			 *  USB_Descriptor_Configuration_Header_t ConfigHeader = DESCRIPTOR_CAST(CurrDescriptor,
 			 *                                                       USB_Descriptor_Configuration_Header_t);
-			 *
+			 *  
 			 *  // Can now access elements of the configuration header struct using the . operator
 			 *  \endcode
 			 */
@@ -231,7 +231,7 @@
 			 *  Usage Example:
 			 *  \code
 			 *  uint8_t EndpointSearcher(void* CurrentDescriptor); // Comparator Prototype
-			 *
+			 *  
 			 *  uint8_t EndpointSearcher(void* CurrentDescriptor)
 			 *  {
 			 *     if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
@@ -239,8 +239,9 @@
 			 *     else
 			 *         return DESCRIPTOR_SEARCH_NotFound;
 			 *  }
-			 *
+			 *  
 			 *  //...
+			 *  
 			 *  // After retrieving configuration descriptor:
 			 *  if (USB_Host_GetNextDescriptorComp(&BytesRemaining, &CurrentConfigLoc, EndpointSearcher) ==
 			 *      Descriptor_Search_Comp_Found)