Adding dynamic USB power support

- Each scan module now has a current change callback which passes the available current as a parameter
- No longer attempts to use the max 500 mA immediately, starts with 100 mA then goes to 500 mA after enumeration
- If enumeration fails due to bMaxPower of 500 mA, then attempt again at 100 mA (might also be possible to go even lower to 20 mA in certain cases)
- Now working with the Apple Ipad (no over-power messages)
- Fixed Wake-up behaviour on Apple Ipad (and likely other iOS devices)
- More effecient set_feature/clear_feature handling (device handler)
- Initial power handling via Interconnect (still needs work to get it more dynamic)

Output/pjrcUSB/arm/usb_dev.h

@@ -81,6 +81,7 @@ static inline uint32_t usb_rx_byte_count(uint32_t endpoint)
 }
 
 void usb_device_reload();
+void usb_device_check();
 
 extern void usb_serial_flush_callback();