Via support for dp60 pcb

[paulgali]

Added VIA support for the DP60

Description

Before the VIA overhaul, the DP60 was supported. There is now no JSON files inside the via category, hence I have created one for this particular PCB. It includes the variable layouts present here

Testing confirmed - https://imgur.com/a/Um3YKfx

QMK Pull Request

qmk/qmk_firmware#9508

New layout_all created specifically for configurable layouts in via. @Wilba6582 the QMK PR should go live before this I believe? Or does it make much of a difference?

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

[paulgali]

Need to rework JSON, will reopen shortly

[paulgali]

I am creating a new macro layout for the dp60, under layout_all, before this should go live. Once that is merged into QMK I will trigger this PR.

[paulgali]

Testing complete. See https://imgur.com/a/Um3YKfx

[paulgali]

QMK branch updated with an enhanced 'default' layout https://imgur.com/a/A2QwEbQ

Update here . QMK branch is ready to be merged.