Support chained 64x32

[albpara]

Note

This is a work in progress, do not review yet

After my frustration for not being capable of using my 64x32 panel to build this amazing clock, I decided to give it a try and make the option to chain this panels configurable.

I followed the instructions in Can I chain Panels? from ESP32-HUB75-MatrixPanel-DMA I quickly noticed the following statement:

Finally, if you wanted to chain 4 x (64x32px) panels to make 128x64px display (essentially a 2x2 grid of 64x32 LED Matrix modules), a little more magic will be required. Refer to the VirtualMatrixPanel example and the AuroraDemo example of its practical use.

Basically... if you need more than 1 row of panels, you should use VirtualMatrixPanel which I guess that could handle also the original use case of 64x64 panels even though is not strictly needed.

I need to test this in a single 64x64 panel since I don't have those (give it a go please @jnthas) but I think that it should work.

Added a setting section too to make this easily configurable

Apologies for the diff changes about format in firmware/lib/cw-commons/CWWebServer.h, those were made automatically by my VSCode, I can revert those if requested

[jnthas]

I can test it here. Just let me know when is ready. Thanks for the PR!