webui: update colorpicker

ref. https://github.com/xoseperez/espurna/issues/1132#issuecomment-431868924
it is slightly bigger, but better looking and no jquery dependency

rework colorpicker style as well, hide to prevent sending garbage when
lights are off. update lights module to send `lightState()` and separate
state from status payloads

yes, input[type="color"] is an option, but it does not look good

code/espurna/light.cpp

@@ -1274,6 +1274,7 @@ void _lightWebSocketStatus(JsonObject& root) {
         channels.add(lightChannel(id));
     }
     root["brightness"] = lightBrightness();
+    root["lightstate"] = lightState();
 }
 
 void _lightWebSocketOnVisible(JsonObject& root) {
@@ -1294,8 +1295,6 @@ void _lightWebSocketOnConnected(JsonObject& root) {
 #if RELAY_SUPPORT
     root["ltRelay"] = getSetting("ltRelay", 1 == LIGHT_RELAY_ENABLED);
 #endif
-
-    _lightWebSocketStatus(root);
 }
 
 void _lightWebSocketOnAction(uint32_t client_id, const char * action, JsonObject& data) {
@@ -1842,6 +1841,7 @@ void lightSetup() {
         wsRegister()
             .onVisible(_lightWebSocketOnVisible)
             .onConnected(_lightWebSocketOnConnected)
+            .onData(_lightWebSocketStatus)
             .onAction(_lightWebSocketOnAction)
             .onKeyCheck(_lightWebSocketOnKeyCheck);
     #endif