Add Arduino IDE support

[drtrigon]

Please add support for Arduino IDE.

[drtrigon]

I might be clever to merge this project with https://github.com/drtrigon/fpgarduino-icestorm

Opinions on this?

[drtrigon]

@Obijuan: What do you think about combining/merging with https://github.com/drtrigon/fpgarduino-icestorm? No intresst in making it compatible with Arduino IDE?