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Fix #66

Usb core fixes

Print::write(const uint8_t *buffer, size_t size) and Print::print(const
__FlashStringHelper *ifsh) would continue calling write(char) after a
failed write(char) this behavior would render returned count unuseable
see arduino/Arduino issue #3614

The number of hyphens in this URL has apparently changed.

This makes the CDC "Serial" object on the Leonardo and similar boards
support this recently introduced method as well. The CDC code in the sam
core is not changed.

end() already waited for the buffer to be empty, but then there could
still be two bytes in the hardware registers that still need to be
transmitted (which were dropped or kept in the buffer, depending on the
exact timing).

This changes the wait loop to a call to the flush() function, which
already takes care of really waiting for all bytes to be transmitted,
meaning it is safe to turn off the transmitter.

This allows detecting when the USB host sends a break request and what
the value of the request was. See the comments in USBAPI.h for details.

This just modifies the avr core, not the sam core.

This allows a sketch to find out the settings chosen by the USB host
(computer) and act accordingly.

Other than reading the DTR flag and checking if the baudrate is 1200,
the regular CDC code doesn't actually use any of these settings.

By exposing these settings to the sketch, it can for example copy them
to the hardware UART, turning the Leonardo into a proper USB-to-serial
device. This can be useful to let the computer directly talk to whatever
device is connected to the hardware serial port (like an XBee module).

The Teensy core already supported these methods. This code was
independently developed, but the method names were chosen to match the
Teensy code, for compatibility (except that `dtr()` and `rtr()` return
`bool`, while the Teensy version return a `uint8_t`).

This change is applied to both the avr and sam cores, which have a very
similar CDC implementation.

with this PR you can add

\#include Keyboard.h
\#include Mouse.h
\#include HID.h

in the top of the sketch and you will expose a Mouse+Keyboard

From the library pow, simply add

static HID_Descriptor cb = {
	.length = sizeof(_hidReportDescriptor),
	.descriptor = _hidReportDescriptor,
};
static HIDDescriptorListNode node(&cb);
HID.AppendDescriptor(&node);

in the class' constructor and you are done!

and restore it in case of aborted reboot
use RAMEND-1 as suggested by @yyyc514 in PR #2474

of course it's not a real solution but we cannot force everyone to update the bootloader using an external programmer

was really too common

this is a rework of commit fbcf94801b8bba7f1c8c79cc7ae402b6b9dbb2d3

thanks @matthijskooijman

override this function to insert additional USB endpoints