Add support for Grafik Eye QS keypad

[kevineriklee]

I tested this with the Grafik Eye QS attached to my RadioRA2 main repeater and it appears to work.

A few design decisions that are worth discussing:

• I prepended "ColumnN" to the name of any button that appears in a shade column. This is because when events are fired in Home Assistant, they can only be distinguished based on the button name, so I need these to be unique. I imagine that most other people will have identical button names across the multiple shade columns (at the very least, Raise and Lower will be the same since they have no engraving), so I'd argue we need some way to distinguish them.
• I kept "Unknown Button" the same without prepending "ColumnN". This is because Home Assistant specially checks for that string, so I didn't want to break that functionality for people.
• There is no rhyme or reason to the mapping of button and LED component IDs for the Grafik Eye QS, and there is no way to determine it by examining the XML (that I could tell), so I had to resort to hard coding a bunch of stuff. I think this was done in a nice way, but let me know if you have suggestions.

[thecynic]

small nit, but otherwise looks good.

[thecynic]

Feel free to reupload, I haven't heard back since last time i commented.

[kevineriklee]

Sorry life got busy and I didn't get a chance to look at this for a while...

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