Non-interactive way to run `clickable create`

Currently an interactive shell is required to execute clickable create. It is convenient on the desktop, but I think a non-interactive API could be useful to integrate clickable into other scripts/programs. Personally I could use such an API to provide a UI for creating new projects within the Seabass :-)

The idea is to be able to do something like

clickable create \
  --template <template> \
  --title <app title> \
  --description <app description> \
  --name <app name> \
  --namespace <namespace> \
  --author <maintainer name> \
  --email <maintainer email> \
  --license <license>