Command-line Mac OSX export inconsistent with GUI export

[lekoder]

Godot version:
3.1.alpha.custom_build.0dbe014

OS/device including version:
Windows 10

Issue description:
The OSX export is a .zip file containing the application. When exporting with command line with:

$GODOT --export "Mac OSX" $OUTDIR/game.zip $PROJECT

The resulting zip file is not the mac export, but just zipped source files.

Exporting with:

$GODOT --export "Mac OSX" $OUTDIR/game.app $PROJECT

Produces correct file, but with incorrect name (should be game.zip).

Steps to reproduce:

$GODOT --export "Mac OSX" $OUTDIR/game.zip $PROJECT

where GODOT is the Godot's binary and PROJECT is the path to project.godot

I understand that Godot decides on the format based on pkg or zip extension, and it misses the point with Mac export. I suggest adding explicit --export-format to the CLI interface.

[Calinou]

I can confirm this on commit c5656b7.