Adding initial Teensy 3 support, compiles, but not fully functional yet.

- CDC Output seems to be working
- USB Keyboard output has not been tested, but is "ready"
- UART and Timers have not been tested, or fully utilized
- Issues using Timer 0
- Initial template for MBC-55X Scan module (only module currently compatible with the arm build)
- Updated the interface to the AVR usb module for symmetry with the ARM usb module
- Much gutting was done to the Teensy 3 usb keyboard module, though not in an ideal state yet

Lib/pin_map.teensy3

@@ -0,0 +1,46 @@
+// Pin				Arduino
+//  0	B16			RXD
+//  1	B17			TXD
+//  2	D0			
+//  3	A12	FTM1_CH0	
+//  4	A13	FTM1_CH1	
+//  5	D7	FTM0_CH7	OC0B/T1
+//  6	D4	FTM0_CH4	OC0A
+//  7	D2			
+//  8	D3			ICP1
+//  9	C3	FTM0_CH2	OC1A
+// 10	C4	FTM0_CH3	SS/OC1B
+// 11	C6			MOSI/OC2A
+// 12	C7			MISO
+// 13	C5			SCK	
+// 14	D1			
+// 15	C0			
+// 16	B0	(FTM1_CH0)	
+// 17	B1	(FTM1_CH1)	
+// 18	B3			SDA
+// 19	B2			SCL
+// 20	D5	FTM0_CH5	
+// 21	D6	FTM0_CH6	
+// 22	C1	FTM0_CH0	
+// 23	C2	FTM0_CH1	
+// 24	A5	(FTM0_CH2)	
+// 25	B19
+// 26	E1
+// 27	C9
+// 28	C8
+// 29	C10
+// 30	C11
+// 31	E0
+// 32	B18
+// 33	A4	(FTM0_CH1)
+// (34)	analog only
+// (35)	analog only
+// (36)	analog only
+// (37)	analog only
+
+// not available to user:
+//	A0	FTM0_CH5	SWD Clock
+//	A1	FTM0_CH6	USB ID
+//	A2	FTM0_CH7	SWD Trace
+//	A3	FTM0_CH0	SWD Data
+