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Fix #4784
Close #4791

Forgot to fix ethernet board in previous commit

Avrdude has changed the way it handle unused bits in the extended fuse for atmega 328 and atmega 168, they are now at 1 instead of 0.
See http://svn.savannah.nongnu.org/viewvc?view=rev&root=avrdude&revision=1335 for more info.
This causes avrdude to fail when one try to write the fuse with the unused bits at 0, because the value it read back is not the same than the one it tried to write. This commit fixes the fuse value for all boards that use atmega328 or 168.

Change double quotes to single quotes

Signed-off-by: Patrick Roncagliolo <ronca.pat@gmail.com>

- "." is a string literal, and so is treated as the char '.' plus the null char '\0'.
- Single quotes reduces the necessary memory for this literal to only one char instead.
  A string literal as the one actually present may require the use of the
  method "write(const char *str)", so there could be also a performance overhead.
- Another reason to change quotes style is for consistency with line 235.
Signed-off-by: Patrick Roncagliolo <ronca.pat@gmail.com>

Both serial and OTA upload methods

OTA upload uses the ESP8266 method with a custom upload tool (https://github.com/arduino/arduinoOTA)

While not plainly wrong, since the board is not contained in a 3rd party package, use the "baseline" reference method

Add Arduino.org board definitions

See #2075

remember to correct the core size and checksum when pushing the official core

We'll need to patch avrdude with this new programmer type
https://github.com/platformio/platformio-core/issues/717

Yun derived (Industrial101, YunMini, LininoOne) and Leonardo Ethernet

Fixes #5539

This adds the configuration needed to support JTAGICE3.

Arduino AVR Boards 1.6.11 added the {upload.verify} property to the tools.avrdude.upload recipe and {program.verify} to the tools.avrdude.program recipe to support the File > Preferences > Verify code after upload setting.

In Arduino IDE versions 1.6.8 and previous upload.verify is set to true or false depending on the preferences setting which causes Upload to an AVR board with Arduino IDE 1.6.8 or older and Arduino AVR Boards 1.6.11 or newer to generate AVRDUDE commands like:

avrdude -CC:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino2/etc/avrdude.conf -v true -patmega328p -carduino -PCOM21 -b115200 -D -Uflash:w:C:\Users\per\AppData\Local\Temp\buildece560c1024a4a94b7c3b05be61aa2fc.tmp/sketch_sep28a.ino.hex:i

program.verify is unset, which causes Upload Using Programmer to an AVR board with Arduino IDE 1.6.8 or older and Arduino AVR Boards 1.6.11 or newer to generate AVRDUDE commands like:

avrdude -CC:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino6/etc/avrdude.conf -v {program.verify} -patmega328p -cusbasp -Pusb -Uflash:w:C:\Users\per\AppData\Local\Temp\build77ff2e21c5523c5895e8d065447461cb.tmp/sketch_sep28a.ino.hex:i

AVRDUDE 6.0.1 is able to ignore the spurious item in the command and successfully upload but when used with AVRDUDE 6.3.0 this causes upload to fail:

avrdude: no programmer has been specified on the command line or the config file
         Specify a programmer using the -c option and try again

This means that Arduino AVR Boards 1.6.12 and 1.6.14 are not backwards compatible with Arduino IDE 1.6.8 and previous.

Setting a default empty value for the upload.verify and program.verify properties in platform.txt causes Arduino IDE 1.6.8 and older to generate an AVRDUDE command identical to that generated with Arduino AVR Boards 1.6.10 or older(meaning that, as previously, the preferences setting has no effect):

avrdude -CC:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino2/etc/avrdude.conf -v -patmega328p -carduino -PCOM21 -b115200 -D -Uflash:w:C:\Users\per\AppData\Local\Temp\buildece560c1024a4a94b7c3b05be61aa2fc.tmp/sketch_sep28a.ino.hex:i

Arduino IDE 1.6.9 and newer overrides the default values of upload.verify and program.verify, therefore this change has no effect on the AVRDUDE command generated and verification is controlled by the preferences setting as usual.

Tested back to Arduino IDE 1.6.2, the oldest IDE version that supports Boards Manager updates.

`toFloat` internally converts into double and then truncates into a
float, so why not add a method to return the double?

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)