* plugins/nico/projectify/tiddlers/ui/widgets/date-picker.js: Set the first day
of the week in date pickers base on the new configuration option.
* plugins/nico/projectify/tiddlers/config/config.multids: New configuration
option FirstDiayOfWeek.
* plugins/nico/projectify/tiddlers/language/en-GB/index.multids: New language
strings.
* plugins/nico/projectify/tiddlers/ui/config/Calendar.tid: New tab in the
configuration panel for calendar settings.
* plugins/nico/projectify/tiddlers/changelog.tid: Update.

* New redesigned input for adding todos
* New buttons for scheduling and setting a priority directly when adding a todo

Add translation.

I18n es

Update Simplified Chinese for index.multids

Move down the "convert into project" button in the todo actions dropdown.

Fix the filter macro used in the filter dashboard tab

Fix the position of the scheduled dropdown in the topbar

Fix the rendering of todo captions in the scheduled dropdown

New configuration option to show completed tasks by default

* Move all plugins to plugins/nico/
* Remove symlinks to plugins from all editions
* Use TIDDLYWIKI_PLUGIN_PATH in npm scripts
* Add cross-env dev-dependency for Windows compatibility

Improve german translation.

Instead of toggling the state of the todo, link to the tiddler.