EMC optimisations

-eth shield is not connected to the GND rather it shields "input" of poe
-used smaller package for bulk PoE capacitor
-Changed common mode filter to Pulse T8113
-Added more inductor filters on the primary side
-replaced secondary side ferrite silter with an inductor
-used distributed "flyback" capacitor (3 instead of 1)
-slightly increased distance between the poe transformer and the
ethernet signal traces
- extended GND1 under the transformer
- primary snubber circuit is now in "hot-loop" area
-repositioned poe enable optocoupler

Signed-off-by: Dominik Sliwa <dominik@sliwa.io>

Yellow.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 0,
+    "active_layer": 37,
     "active_layer_preset": "",
     "auto_track_width": false,
     "hidden_nets": [],
@@ -63,7 +63,7 @@
       35,
       36
     ],
-    "visible_layers": "fffffff_ffffffff",
+    "visible_layers": "ffffff0_ffffffff",
     "zone_display_mode": 0
   },
   "meta": {