Add 'DevicePEQ' as an equalizer app option.

[foldfree]

Add support for DevicePEQ to enable direct USB PEQ transfer to compatible dongles.

Implementation Reference:
Already integrated in squig.link sites like graph.hangout.audio

Supported Devices (partial list):

FiiO: JA11, KA15, KA17, K11 R2R, K13 R2R (Retro Nano has limited compatibility)
Moondrop: CDSP, Chu II DSP, Quark2, Echo A
Tanchjim: Bunny DSP, One DSP
EPZ: GM20, TP13
Kiwi Ears: Allegro, Allegro Pro
JCally: JM20 Pro, JM12, and similar models
Other Walkplay-compatible devices
KTMicro DSP devices

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Thank you for looking into it~