Applied important changes of other forks after master ESPAsyncWebServer release (at the moment)

- fixes
- SPIFFSEditor is changed to be standalone - works with acefull.js.gz, see the example
Added a real SmartSwitch application to examples

src/WebRequest.cpp

@@ -96,6 +96,10 @@ AsyncWebServerRequest::~AsyncWebServerRequest(){
   if(_tempFile){
     _tempFile.close();
   }
+  
+  if(_itemBuffer){
+    free(_itemBuffer);
+  }
 }
 
 void AsyncWebServerRequest::_onData(void *buf, size_t len){