Add scripts for the generation of keyboard switch footprints

[perigoso]

These scripts generate footprints for common switches used in keyboard applications, they include user drawing to aid the layout.

I understand the scripts might not be in great shape, my python is rough. Open to some feedback.

There is an issue with these scripts (or KicadModTree itself) it can be visualized in the second picture, it seems the offset=[x,y] seems to not be taken into account like it should in kicad_mod.append(Pad(number=2, type=Pad.TYPE_THT, shape=Pad.SHAPE_OVAL, at=[-3.81,-2.54], size=[4.46156,2.5], rotation=48, offset=[0.980778,0], drill=1.5, layers=['*.Cu', 'B.Mask'])) any input?

[codeclimate[bot]]

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[perigoso]

Detected Issues to be resolved before merge:

• [ ] Ignored offset issue
• [x] 3D model settings
• [x] Second Reference Designator missing
• [x] This tag:
• [x] Script description on the start of the script