Add CFTKB Mysterium and Discipad VIA support

[brandonschlack]

Description

Adds CFTKB Mysterium and Discipad to VIA, based on the maintainer @coseyfannitutti previous work with the Discipline and Romeo. Both have been tested on devices with the VIA Design tab.

QMK Pull Request

qmk/qmk_firmware#8794

Checklist

• The QMK source code follows the guide here: https://caniusevia.com/docs/configuring_qmk
• The VIA definition follows the guide here: https://caniusevia.com/docs/layouts
• I have tested this keyboard definition using VIA's "Design" tab.
• I have tested this keyboard definition with firmware on a device.
• I have assigned alpha keys and modifier keys with the correct colors.
• The Vendor ID is not 0xFEED

[wilba]

Mysterium KLE doesn't have all the "modifier" keys with "modifier" color... arrows, nav keys, F keys, system keys, backspace.

The aim is to make them look like a standard keyset with two colors, often referred to as "alphas" and "modifiers". Accents for Esc, Enter, arrows, etc. are optional.

https://caniusevia.com/docs/layouts#kle-json-rules

[brandonschlack]

Fixed issues with discipad formatting and mysterium modifier color.