Allow FAN_PIN override, pins cleanup (#10956)

Marlin/src/pins/pins_5DPRINT.h

Marlin/src/pins/pins_ALLIGATOR_R2.h

Marlin/src/pins/pins_ANET_10.h

Marlin/src/pins/pins_ARCHIM2.h

Marlin/src/pins/pins_AZSMZ_MINI.h

Marlin/src/pins/pins_AZTEEG_X3_PRO.h

Marlin/src/pins/pins_AZTEEG_X5_GT.h

Marlin/src/pins/pins_BEAST.h

Marlin/src/pins/pins_BIQU_BQ111_A4.h

Marlin/src/pins/pins_BRAINWAVE.h

Marlin/src/pins/pins_BRAINWAVE_PRO.h

Marlin/src/pins/pins_CHEAPTRONICv2.h

Marlin/src/pins/pins_CHITU3D.h

Marlin/src/pins/pins_CNCONTROLS_11.h

Marlin/src/pins/pins_CNCONTROLS_12.h

Marlin/src/pins/pins_COHESION3D_MINI.h

Marlin/src/pins/pins_COHESION3D_REMIX.h

Marlin/src/pins/pins_DUE3DOM.h

Marlin/src/pins/pins_DUE3DOM_MINI.h

Marlin/src/pins/pins_EINSY_RAMBO.h