Update preview nodes

- Support custom background color in preview node
- Fix Preview node does not update automatically with same mesh name
- Add system config file that allow custom clients IP address

web/js/sharedFunctions.js

@@ -0,0 +1,14 @@
+export function getRGBValue(colorString="rgb(0, 0, 0)", scale01=false) {
+    var color = colorString.split(/[\D]+/).filter(Boolean)
+    for (let index = 0; index < color.length; index++) {
+        color[index] = Number(color[index]);
+    }
+
+    if (scale01) {
+        for (let index = 0; index < color.length; index++) {
+            color[index] = color[index] / 255;
+        }
+    }
+
+    return color;
+}