add CharacterWidthDeterminer

src/core/CharacterWidthDeterminer.h

@@ -0,0 +1,12 @@
+#ifndef CHARACTERWIDTHDETERMINER_H
+#define CHARACTERWIDTHDETERMINER_H
+
+#include <stdint.h>
+
+class CharacterWidthDeterminer
+{
+public:
+    virtual int operator()(uint32_t character);
+};
+
+#endif