Styling/integration refactoring.

- Instead of onload override, move to RFB.load function that takes
  a parameter for the target DOM ID. This allows the user to have
  their own onload function.

- Add "VNC_" prefix to all element ID names. Only create DOM elements
  if they don't already exist on the page, otherwise use the existing
  elements.

- Move all styling to separate stylesheet.

- Use list model for control styling.

include/plain.css

@@ -0,0 +1,50 @@
+#VNC_controls {
+    overflow: hidden;
+}
+#VNC_controls ul {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+}
+#VNC_controls li {
+    float: left;
+    margin-right: 15px;
+}
+
+#VNC_host {
+    width: 100;
+}
+#VNC_port {
+    width: 50;
+}
+#VNC_password {
+    width: 80;
+}
+#VNC_encrypt {
+}
+#VNC_connect_button {
+    width: 100px;
+}
+
+#VNC_status {
+    margin-top: 15px;
+    text-align: center;
+    background: #eee;
+}
+
+/* Do not set width/height for VNC_screen or VNC_canvas or incorrect
+ * scaling will occur. Canvas resizes to remote VNC settings */
+#VNC_screen {
+    text-align: center;
+    display: table;
+}
+#VNC_canvas {
+    background: #eee;
+}
+
+#VNC_clipboard_clear_button {
+}
+#VNC_clipboard_text {
+    font-size: 9;
+}
+