Update copyright year on all source files.

Bootloaders/CDC/BootloaderCDC.c

Bootloaders/CDC/BootloaderCDC.h

Bootloaders/CDC/Descriptors.c

Bootloaders/CDC/Descriptors.h

Bootloaders/DFU/BootloaderDFU.c

Bootloaders/DFU/BootloaderDFU.h

Bootloaders/DFU/Descriptors.c

Bootloaders/DFU/Descriptors.h

Bootloaders/makefile

Demos/Device/ClassDriver/AudioInput/AudioInput.c

Demos/Device/ClassDriver/AudioInput/AudioInput.h

Demos/Device/ClassDriver/AudioInput/Descriptors.c

Demos/Device/ClassDriver/AudioInput/Descriptors.h

Demos/Device/ClassDriver/AudioOutput/AudioOutput.c

Demos/Device/ClassDriver/AudioOutput/AudioOutput.h

Demos/Device/ClassDriver/AudioOutput/Descriptors.c

Demos/Device/ClassDriver/AudioOutput/Descriptors.h

Demos/Device/ClassDriver/DualVirtualSerial/Descriptors.c

Demos/Device/ClassDriver/DualVirtualSerial/Descriptors.h

.../Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c