fix #112: trim utf8 bom

cpputil/iniparser.cpp

@@ -120,7 +120,12 @@ int IniParser::LoadFromFile(const char* filepath) {
 
     std::string str;
     file.readall(str);
-    return LoadFromMem(str.c_str());
+    const char* c_str = str.c_str();
+    unsigned char utf8_bom[3] = { 0xEF, 0xBB, 0xBF };
+    if (str.size() >= 3 && memcmp(c_str, utf8_bom, 3) == 0) {
+        c_str += 3;
+    }
+    return LoadFromMem(c_str);
 }
 
 int IniParser::LoadFromMem(const char* data) {