Added cm4 standoffs, usb rec. button, DC_IN pull-down

Added:
- solderable standoffs for the CM4
- DC_IN_F pulldown for D2 high temp reverse current control R44
Modified:
- USB recovery jumper JP2 replaced with a button SW3
- R64 changed to 33k from 6.8k

Yellow.kicad_prl

@@ -18,7 +18,7 @@
       "footprints": true,
       "graphics": true,
       "keepouts": true,
-      "lockedItems": true,
+      "lockedItems": false,
       "otherItems": true,
       "pads": true,
       "text": true,