added preset saving and heat transfer

presets/constraints.json

@@ -0,0 +1,11 @@
+{
+  "C1": {
+    "B_max_T": 1,
+    "Vp_max": 50,
+    "Vs_max": 90,
+    "Ip_max": 3,
+    "Is_max": 2,
+    "P_out_max_W": 100
+  },
+  "_last": "C1"
+}

presets/core.json

@@ -0,0 +1,11 @@
+{
+  "FT-3KM F4424G": {
+    "ID_mm": 21.5,
+    "OD_mm": 46.5,
+    "height_mm": 22.8,
+    "fill_factor": 0.35,
+    "Ae_mm2": 142.5,
+    "Ve_mm3": 15219
+  },
+  "_last": "FT-3KM F4424G"
+}

presets/sim.json

@@ -0,0 +1,12 @@
+{
+  "points": {
+    "frequencies": "256\n870\n3140\n8900\n12000\n16000\n22000\n33000\n45000",
+    "loads": "5\n10\n50\n100\n200\n600\n2000",
+    "target_power_W": 25,
+    "power_tol_pct": 2,
+    "Vp_min": 1,
+    "Vp_max": 50,
+    "Vp_steps": 100
+  },
+  "_last": "points"
+}

presets/windings.json

@@ -0,0 +1,35 @@
+{
+  "Design 1": {
+    "windings": [
+      {
+        "name": "primary",
+        "taps": [
+          0,
+          25,
+          50
+        ],
+        "awg": [
+          22,
+          22
+        ]
+      },
+      {
+        "name": "secondary",
+        "taps": [
+          0,
+          100,
+          50,
+          50,
+          50
+        ],
+        "awg": [
+          22,
+          22,
+          22,
+          22
+        ]
+      }
+    ]
+  },
+  "_last": "Design 1"
+}