Adds the task to the specified project, in the optional location
specified. If no location arguments are given, the task will be added to
the end of the project.
addProject can also be used to reorder a task within a project or
section that already contains it.
At most one of insert_before, insert_after, or section should be
specified. Inserting into a section in an non-order-dependent way can be
done by specifying section, otherwise, to insert within a section in a
particular place, specify insert_before or insert_after and a task
within the section to anchor the position of this task.
Returns an empty data block.
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