Variou details:

- Put the MIT copyright at the end.
- Move the directory /other -> tools
- Various improvements.

src/ftxui/screen/wcwidth.cpp

@@ -1,7 +1,3 @@
-// Copyright 2020 Arthur Sonzogni. All rights reserved.
-// Use of this source code is governed by the MIT license that can be found in
-// the LICENSE file.
-
 /*
  * This is an implementation of wcwidth() and wcswidth() (defined in
  * IEEE Std 1002.1-2001) for Unicode.
@@ -307,3 +303,7 @@ int wstring_width_cjk(const std::wstring& text) {
 }
 
 }  // namespace ftxui
+
+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.