Use a consistent naming convention for elements

* Element names we use "_" as word-delimiter, not "-"
* Element names use less camel-case
* Element names end with the type
* Element names always start with noVNC_

include/black.css

@@ -6,7 +6,7 @@
  * This file is licensed under the 2-Clause BSD license (see LICENSE.txt).
  */
 
-#keyboardinput {
+#noVNC_keyboardinput {
   background-color:#000;
 }