Minor code cleanups, remove TemperatureDataLogger host application's Visual Studio Solution files, add LibHIDNet license files.

Fixed DFU bootloader programming not discarding the correct number of filler bytes from the host when non-aligned programming ranges are specified (thanks to Thomas Bleeker).

Enhance TemperatureDatalogger project -- add RTC capabilities so that data is logged along with the current time and date. Make logging interval configurable, set by a C# PC host application.

Add new TemperatureDataLogger project, a simple USB Mass Storage class Temperature Data Logger using the onboard Dataflash and Temperature sensor.