Release 4.7

• Added feat to filter to-dos within a project.
• Added feat to attach attachments to a task.
• Added feat to play a sound when completing a task (if you want to).
• Fixed bug that duplicated projects when dragging into a sub-project (#1252).
• Fixed a bug when dragging a subtask out of a section and dragging it back in, the subtask would disappear (#1253).
• Hindi translation update thanks to @Scrambled777.
• Bulgarian translation added thanks to @twlvnn.