Config options for default author, maintainer etc

[reynir]

Desired Behavior

Running dune init project myproject uses values from ~/.config/dune/config to populate values in dune-project such as authors, maintainers and possibly more.

Example

dune init project myproject generates, among other files, a dune-project file with stanzas such as (authors "Author Name") and (maintainers "Maintainer Name") which has to be edited manually every time even if my name is the same between invocations.