Add ground fills, fix some clearance issues, make all power traces large

Fireball/Fireball.kicad_pro

@@ -48,7 +48,13 @@
           "min_clearance": 0.508
         }
       },
-      "diff_pair_dimensions": [],
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        }
+      ],
       "drc_exclusions": [],
       "meta": {
         "version": 2
@@ -112,8 +118,15 @@
         "solder_mask_min_width": 0.0,
         "use_height_for_length_calcs": true
       },
-      "track_widths": [],
-      "via_dimensions": [],
+      "track_widths": [
+        0.0
+      ],
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        }
+      ],
       "zones_allow_external_fillets": false,
       "zones_use_no_outline": true
     },