Move out many of the common class driver constants into grouped enums, to make them more managable.

Add new CDC descriptor structs to the CDC class driver, so that the CDC demos can use human readable field names.

Rename prefix for Still Image Host class driver functions from "SImage_" to "SI_" to remain consistent with the rest of the driver.

LUFA/ManPages/FutureChanges.txt

@@ -18,11 +18,11 @@
   *      -# Add ability to get number of bytes not written with pipe/endpoint write routines after an error
   *      -# Change makefiles to allow for absolute LUFA location to be used
   *      -# Re-add interrupt Pipe/Endpoint support
+  *      -# Fix intermittent device mode enumeration errors
   *  - Documentation/Support
   *      -# Add detailed overviews of how each demo works
   *      -# Add board overviews
   *      -# Write LUFA tutorials
-  *      -# Add makefile template
   *  - Demos/Projects
   *      -# Multiple-Report HID device
   *      -# Device/Host USB bridge
@@ -31,6 +31,7 @@
   *      -# Finish BluetoothHost demo
   *      -# Finish SideShow demo
   *      -# Finish StandaloneProgrammer project
+  *      -# Arduino Uno compatible USB-MIDI, USB-HID
   *  - Ports
   *      -# AVR32 UC3B series microcontrollers
   *      -# Atmel ARM7 series microcontrollers