Added proxy for writing integer values into config attributes.

src/config.cpp

@@ -38,6 +38,12 @@ config::proxy_string &config::proxy_string::operator=(bool b)
 	return *this;
 }
 
+config::proxy_string &config::proxy_string::operator=(int v)
+{
+	real_str_ = str_cast(v);
+	return *this;
+}
+
 config config::invalid;
 
 const char* config::diff_track_attribute = "__diff_track";

src/config.hpp

@@ -181,6 +181,7 @@ public:
 		{ return this->operator=(other.real_str_); }
 
 		proxy_string &operator=(bool);
+		proxy_string &operator=(int);
 
 		proxy_string& operator=(const char *str)
 		{ real_str_ = str; return *this; }