add more parts for pcb2 and work on placement

pcb2/lars2.kicad_prl

 {
   "board": {
-    "active_layer": 44,
+    "active_layer": 0,
     "active_layer_preset": "All Layers",
     "auto_track_width": true,
     "hidden_netclasses": [],

pcb2/lars2.kicad_pro

           "min_clearance": 0.5
         }
       },
-      "diff_pair_dimensions": [],
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        }
+      ],
       "drc_exclusions": [],
       "meta": {
         "version": 2
           "td_width_to_size_filter_ratio": 0.9
         }
       ],
-      "track_widths": [],
+      "track_widths": [
+        0.0,
+        2.0
+      ],
       "tuning_pattern_settings": {
         "diff_pair_defaults": {
           "corner_radius_percentage": 80,
           "spacing": 0.6
         }
       },
-      "via_dimensions": [],
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        }
+      ],
       "zones_allow_external_fillets": false
     },
     "ipc2581": {