State machine refactoring.

Add new states 'loaded', 'connect' and 'fatal':
- Loaded state is first page state. Pass WebSockets mode message using
  this state.
- Connect indicates that the user has issued a "connect" but we
  haven't gotten an WebSockets onopen yet.
- Fatal is a condition that indicates inability to continue on: right
  now, lack of WebSockets/Flash or non-working canvas.

Move much of the actual state transition code into updateState.

Handle 'password' state better in default_controls.js; instead of
disconnecting, prompt for password to send.

Add comments to updateState indicating possible states.

include/default_controls.js

@@ -82,6 +82,12 @@ load: function(target) {
         };
 },
 
+setPassword: function() {
+    console.log("setPassword");
+    RFB.sendPassword($('VNC_password').value);
+    return false;
+},
+
 sendCtrlAltDel: function() {
     RFB.sendCtrlAltDel();
 },
@@ -94,6 +100,7 @@ updateState: function(state, msg) {
     cad = $('sendCtrlAltDelButton');
     switch (state) {
         case 'failed':
+        case 'fatal':
             c.disabled = true;
             cad.disabled = true;
             klass = "VNC_status_error";
@@ -106,6 +113,7 @@ updateState: function(state, msg) {
             klass = "VNC_status_normal";
             break;
         case 'disconnected':
+        case 'loaded':
             c.value = "Connect";
             c.onclick = DefaultControls.connect;
 
@@ -113,6 +121,14 @@ updateState: function(state, msg) {
             cad.disabled = true;
             klass = "VNC_status_normal";
             break;
+        case 'password':
+            c.value = "Send Password";
+            c.onclick = DefaultControls.setPassword;
+
+            c.disabled = false;
+            cad.disabled = true;
+            klass = "VNC_status_warn";
+            break;
         default:
             c.disabled = true;
             cad.disabled = true;