code spell checking - part1 (core)

I've found a code spellchecker, so this is what can be corrected easily. Changes are only affecting comments, readme and a few user-visible strings. So no functional impact expected.

wled00/ws.cpp

@@ -35,7 +35,7 @@ void wsEvent(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventTyp
       {
         if (len > 0 && len < 10 && data[0] == 'p') {
           // application layer ping/pong heartbeat.
-          // client-side socket layer ping packets are unresponded (investigate)
+          // client-side socket layer ping packets are unanswered (investigate)
           client->text(F("pong"));
           return;
         }