お絵かき機能を実装.
Merge branch 'feature/drawing' into devel
カウントダウン機能の実装と、描画の有効・無効化を追加.
データ渡すために一旦コミット.
各種画面遷移への対応と、バリデーションの追加.
Merge branch 'devel' into add_otsuka

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
test