3rdparty: add MultiEmulator by 2010kohtep

* patched to be portable, turned into a static library
* integrated to the engine

3rdparty/MultiEmulator/src/StrUtils.cpp

@@ -0,0 +1,12 @@
+#include "StrUtils.h"
+#include <stdlib.h>
+
+void CreateRandomString(char *pszDest, int nLength)
+{
+	static const char c_szAlphaNum[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+	for (int i = 0; i < nLength; ++i)
+		pszDest[i] = c_szAlphaNum[rand() % (sizeof(c_szAlphaNum) - 1)];
+
+	pszDest[nLength] = '\0';
+}