Cleanup and small issues

pio.ini: cleanup debug directives (build_flags_min move to _debug), remove blynks

index.htm/js: 
- visualization in div to turn of if 1D
- scale visualizations if height>width

json.cpp, util.cpp: USER/DEBUG_PRINT changes

wled00/wled_server.cpp

@@ -380,7 +380,7 @@ void initServer()
 
   //called when the url is not defined here, ajax-in; get-settings
   server.onNotFound([](AsyncWebServerRequest *request){
-    DEBUG_PRINTLN("Not-Found HTTP call:");
+    DEBUG_PRINT("Not-Found HTTP call: ");
     DEBUG_PRINTLN("URI: " + request->url());
     if (captivePortal(request)) return;