Adds ADAU1467WBCPZ300RL (the SigmaDSP chip previously missing), plus
PCM1808QPWRQ1, PCM9211PTR, Combo384, MW-1466CORE (ADAU1466 core module),
LME49720MA, CS8421-CZZ, PCM1861DBT, FDC608PZ, IMN10T108, AK5384.
Source repo used legacy KiCad .lib/.dcm format; converted via
kicad-cli sym upgrade. Parts already covered by the official mirrored
libraries (PCM5102A, INA194, AZ1117-3.3, ADAU1452) were intentionally
skipped to avoid duplication. PCM1681-Q1 skipped (KiCad 'extends'
variant, can't stand alone without duplicating PCM1681).
Fixed real defects found in the source footprints during import:
- PCM1808QPWRQ1 had an absolute 3D model path pointing at the upstream
maintainer's own machine (/Users/HILO/...)
- ADAU1467WBCPZ300RL and PCM9211PTR each had two dead 3D model
references (${KICAD_USER_TEMPLATE_DIR} and a bare filename)
All three now use a single ${KIPRJMOD}-relative reference to the STEP
files under 3dmodels/audio/.
LME49720MA imported symbol-only, Footprint property repointed at the
existing MIKILAB_ipc_soic:IPC_SOIC127P600X175-8N instead of duplicating
a generic SOIC-8 footprint.
