restructure code, internalize devices

src/dev/cam/Sienci.LongMill

@@ -0,0 +1,24 @@
+{
+    "file-ext": "nc",
+    "token-space": " ",
+    "strip-comments": true,
+    "pre":[
+        "G21 ; set units to MM (required)",
+        "G90 ; absolute position mode (required)",
+		"G0 F6000 ; default rapid move speed",
+		"G1 F1500 ; default cutting speed"
+    ],
+    "post":[
+        "M30 ; program end"
+    ],
+    "tool-change":[
+        "M6 T{tool} ; change tool to '{tool_name}'"
+    ],
+	"dwell":[
+		"G4 P{time} ; dwell for {time}ms"
+	],
+	"settings": {
+		"bed_width": 760,
+		"bed_depth": 760
+	}
+}