Revert "Replace ItemCallbacks with lambdas (#3948)"

This reverts commit 496c337cdf.

src/WebAdmin.cpp

@@ -21,6 +21,30 @@ static const char DEFAULT_WEBADMIN_PORTS[] = "8080";
 
 
 
+////////////////////////////////////////////////////////////////////////////////
+// cPlayerAccum:
+
+/** Helper class - appends all player names together in an HTML list */
+class cPlayerAccum :
+	public cPlayerListCallback
+{
+	virtual bool Item(cPlayer * a_Player) override
+	{
+		m_Contents.append("<li>");
+		m_Contents.append(a_Player->GetName());
+		m_Contents.append("</li>");
+		return false;
+	}
+
+public:
+
+	AString m_Contents;
+} ;
+
+
+
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // cWebadminRequestData