Basic upgrade to Kicad 7+

Symbols had to be recreated because they were not part of
original dataset.

Footprint library now needs to end in .pretty

Still many DRC warnings, but the basic result ought to be
the same as before now.

dsoxlan.kicad_prl

@@ -1,11 +1,11 @@
 {
   "board": {
     "active_layer": 0,
-    "active_layer_preset": "",
+    "active_layer_preset": "All Layers",
     "auto_track_width": true,
     "hidden_netclasses": [],
     "hidden_nets": [],
-    "high_contrast_mode": 0,
+    "high_contrast_mode": 1,
     "net_color_mode": 1,
     "opacity": {
       "images": 0.6,