Use matrix coordinates to name PCB switches

Generated PCB uses names like SW1 - SWxx (where xx == amount of keys) for switches.
Keyboards can have non-standard matrix setup it would be nice to have switches named with coordinates.

Names like SW0_0, SW1_17, SW6_5 would make it easier to find each key.

For example my keyboard has Escape key in top-left corner but it has 5,2 coordinates in the matrix.

The issue names no files, tests, or entry points. Start by locating the PCB-generation path and the code that assigns sequential SW names, then trace how matrix row and column data is available. Done means generated switches use coordinate names such as SW0_0 and correctly represent non-standard matrix coordinates.

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