Change to 4-layer stack-up

Ethy.kicad_prl

@@ -74,6 +74,8 @@
       false,
       false,
       false,
+      false,
+      false,
       false
     ],
     "col_order": [
@@ -86,7 +88,9 @@
       6,
       7,
       8,
-      9
+      9,
+      10,
+      11
     ],
     "col_widths": [
       0,
@@ -98,6 +102,8 @@
       0,
       0,
       0,
+      0,
+      0,
       0
     ],
     "custom_group_rules": [],

Ethy.kicad_pro

@@ -37,9 +37,9 @@
         "other_text_thickness": 0.15,
         "other_text_upright": false,
         "pads": {
-          "drill": 0.762,
-          "height": 1.524,
-          "width": 1.524
+          "drill": 3.2,
+          "height": 3.2,
+          "width": 3.2
         },
         "silk_line_width": 0.1,
         "silk_text_italic": false,
@@ -191,6 +191,7 @@
         0.0,
         0.2,
         0.25,
+        0.4,
         0.5,
         1.0,
         2.0,