Bug fixes

Fix a potential problem with multi-thread server.
Fix support for generating Mellow configuration.

multithread.cpp

@@ -0,0 +1,48 @@
+#include <mutex>
+
+#include "misc.h"
+
+//safety lock for multi-thread
+typedef std::lock_guard<std::mutex> guarded_mutex;
+std::mutex on_configuring, on_emoji, on_rename;
+
+extern string_array emojis, renames;
+
+void try_config_lock()
+{
+    guarded_mutex guard(on_configuring);
+}
+
+void try_emoji_lock()
+{
+    guarded_mutex guard(on_emoji);
+}
+
+void try_rename_lock()
+{
+    guarded_mutex guard(on_rename);
+}
+
+string_array safe_get_emojis()
+{
+    guarded_mutex guard(on_emoji);
+    return emojis;
+}
+
+string_array safe_get_renames()
+{
+    guarded_mutex guard(on_rename);
+    return renames;
+}
+
+void safe_set_emojis(string_array &data)
+{
+    guarded_mutex guard(on_emoji);
+    emojis.swap(data);
+}
+
+void safe_set_renames(string_array &data)
+{
+    guarded_mutex guard(on_rename);
+    renames.swap(data);
+}