Add support for zipped sketch with embedded libraries

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[ArduinoBot]

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[matthijskooijman]

Would this be a good moment to consider allowing a libraries subdirectory in all sketches? I think this PR adds support for this only for zipped sketches, which I would think is:

1. Incosistent and leads to surprising behaviour
2. A missed opportunity: Loading libraries from inside the sketch folder can greatly enhance the workflow of a complex sketch, for example when its dependency versions are kept using version control and git submodules.

[ArduinoBot]

:white_check_mark: Build completed.

:arrow_down: Build URL: http://downloads.arduino.cc/PR/arduino-builder/arduino-builder-223.zip

:information_source: To test this build:

1. Replace arduino-builder binary (you can find it where you installed the IDE) with the provided one

[ArduinoBot]

:white_check_mark: Build completed.

:arrow_down: Build URL: http://downloads.arduino.cc/PR/arduino-builder/arduino-builder-223.zip

:information_source: To test this build:

1. Replace arduino-builder binary (you can find it where you installed the IDE) with the provided one

[lmihalkovic]

Cool ... i see you have played with the idea... the IDE side is pretty straightforward .. i started doing the building blocks again on the 1.9.0 a couple days ago.

[lmihalkovic]

Using your suffix instead of mine (have not written support for the embedded libraries yet)

[ArduinoBot]

:white_check_mark: Build completed.

:arrow_down: Build URL: http://downloads.arduino.cc/PR/arduino-builder/arduino-builder-223.zip

:information_source: To test this build:

1. Replace arduino-builder binary (you can find it where you installed the IDE) with the provided one