Add support for the USB HID SystemControl page
Add support for waking up a host via USB HID.

This functionality originated in pull request:
https://github.com/arduino/Arduino/pull/1488/

Jesse can attest to the functionality (tested on OS X 10.8, 10.9, and
Windows 7 but doesn't have the background to verify the implementation
Updates to the keyboard usage page for HID to extend the range of
available keys & add comments

Originally from https://github.com/arduino/Arduino/pull/1488/
Add an inital pass at complete HID tables for Keyboard, ConsumerControl and
SystemControl
Addeed Mouse.moveAbs() to USB HID for absolute mouse positioning.
as requested in issue #1417.

All parameters have the range of -32768 to 32767 and must be scaled
to screen pixels some examples: x=0, y=0 is the middle of the screen
x=-32768, y=-32768 is the top left corner x=32767, y=-32768 is the
top right corner x=32767, y=32767 is the bottom right corner x=-32768,
y=32767 is the bottom left corner.

Based on commit 7b77d1e84d7b80819f049e5fd6e7bafa0d06521f from
https://github.com/arduino/Arduino/pull/1488

Code slightly massaged by Jesse Vincent to remove overzealous #ifdefs
A first cut of USB "Consumer Control" support
Add USB HID keyboard press and release variants that work with USB HID
Keyboard Keycodes. This makes it possible to send HID key events for
keys that don't appear on a traditional US 104 key keyboard.

This patch is a somewhat rototilled version of the patch linked below.
In particular, i dropped whitespacechanges from the original patch and
changed 0x01 and 0x00 in the code to 1 and 0 to better match the style
of the surrounding code.

Based on patch
https://github.com/weizenspreu/Arduino/commit/1ede2b8abd7c3b74ffc75f28da38b4acdc4817f2.patch
from Pull request 1391.
Switch to less confusingly named HID keyboard character defines.
Additionally, move to a complete list of all keyboard and keypad keycodes
transcribed from the HID specification.
Add IDE keyword highlighting for new USB HID APIs
typo fix
Demo for the AbsoluteMouse API
Demo code for the ConsumerControl and SystemControl APIs
Add my email address to the sample code
Add my email address to the sample code
add an initial delay to the consuemr control demo
add missing entry to keywords.txt
Update keyCode API to simplify method signatures for ease of use