Use cursor name instead of Gdk::CursorType #449
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GTK4で削除される`Gdk::CursorType`のかわりにカーソルテーマの名前[*]を
使います。カーソル名の入力ミスを予防するため文字列リテラルを直接指定する
かわりに定数を使います。
非推奨のシンボルを無効化するマクロ
```
GDK_DISABLE_DEPRECATED
GTK_DISABLE_DEPRECATED
GDKMM_DISABLE_DEPRECATED
GTKMM_DISABLE_DEPRECATED
GIOMM_DISABLE_DEPRECATED
GLIBMM_DISABLE_DEPRECATED
```
コンパイラのレポート
```
../src/article/drawareabase.cpp:5226:70: error: no matching function for call to 'Gdk::Cursor::create(Gdk::CursorType&)'
5226 | m_window->set_cursor( Gdk::Cursor::create( m_cursor_type ) );
| ^
```
[*]: https://developer.gnome.org/gdk3/stable/gdk3-Cursors.html#gdk-cursor-new-from-name
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GTK4で削除される
Gdk::CursorTypeのかわりにカーソルテーマの名前を使います。カーソル名の入力ミスを予防するため文字列リテラルを直接指定するかわりに定数を使います。
非推奨のシンボルを無効化するマクロ
コンパイラのレポート
関連のissue: #229