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Add all analog references supported by the ATtinyX5 series

I was compiling with -Werror and this little error popped up

Also includes Micros per https://www.arduino.cc/en/Reference/SoftwareSerial

Previously, during the build, the full package_index.json was downloaded
and distributed with the Arduino IDE.
This lead to a situation where it was difficult to test new AVR cores
before publishing them to the public package_index.json.

Now the bundled AVR core is specificed in the file:
`hardware/package_index_bundled.json`
this index is loaded from the IDE at startup and the package_index.json
is overlayed on it.

This should also solve part of #5143 (Repeatable builds and snapshots of
package/library indexes)

This must be made together with the release of AVR core 1.6.13.

This reverts commit d20e60862344eb864ab384abe3d85f55c1845f3f.

This avoid build errors on old libraries. It may possibly be removed in
the future after a period of transition.

[AVR][USB] Configurable USB_VERSION value via define

Send an USB remote wakeup if data need to be written

To allow sketches to override value as per #58.

Speed and size improvement in Print::printFloat()

Add getTimeout accessor method.

On Linux, setting autosuspend_delay_ms to N and control to auto allows the host pc to suspend the peripheral. Some Linux distro (Ubuntu, Mint) apply this behaviour by default.
If the sketch's prints where less frequent than N milliseconds the sketch prints would never arrive.
This patch allows sending a remote wakeup event to unsuspend the peripheral and allow the serial prints to be received.

to allow WebUSB development, provide a way to change the USB_VERSION reported
using an additional core.

The additional (webUSB) core will survive IDE and AVR core updates

Subtract one from USB_EP_SIZE in USB_SendSpace

SAM: Add Serial_::availableForWrite

Add PIN_* defines to AVR variants

Port SDA and SCL symbols to SAM

Fixes that more complex methods (like Stream::print(float)) do not work properly.

Without this fix, Wire.print(1.01f); results in '1' because Print::printFloat(double, uint8_t) performs multiple print() and therefore twi_transmit calls. Also Wire.println("Heyho"); results only in a newline character.

In an excess of confidence, these defines were added to Leonardo's variant.h
3rd party boards sometimes avoid inheriting this variant but they still define USBCON, thus breaking the build

Merge branch 'sam-recipe_ar_pattern-backwards-compatibility' of https://github.com/sandeepmistry/Arduino

As I was not able to base the return types of `begin()` & `end()` off the c_str() function, I have changed the source so the features can be used by C++98 code, while still allowing ranged loops in C++11.

This will allow using the String library in a ranged for loop:

```C++
String s = "Hi, this is a test";

for( char c : s )
  Serial.print( c );
```