[WIP] DuckyScript plugin

Allows a DAP to behave like a USB Rubber Ducky by executing DuckyScript files,
which is a BASIC-like language with facilities for sending keystrokes.

A "crash course" on the language can be found at http://71.71.39.6/ducky.txt

This plugin also implements several extensions to vanilla DuckyScript, some of
which are listed below (see source for complete documentation).

 - variables (multicharacter names via hash map)
 - control flow (JUMP/GOTO, IF) with labels
 - expression parsing when a number is needed
 - non-decimal bases
 - bytecode compilation (on computer only)

The compiler and related tools can be found here:
https://github.com/theunamedguy/ducky

NOTE: Changes some entries in the HID usage tables, but doesn't break anything.

TODO:

 - Finish up manual entry
 - Further documentation?
 - More optimization?
 - Arrays (how?)
 - TEST, TEST, TEST!
   - Some features have only been marginally tested and MIGHT NOT WORK CORRECTLY
 - FASTER TYPING!!!
   - Currently averages ~96 keys/sec
   - Theoretical maximum: 500 keys/sec
   - Of interest: G#1223 (http://gerrit.rockbox.org/r/1223/)

Change-Id: I149ecd08ba124f8b8637a002ee2652dd54a44e58

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