Rename spago bundle and spago make-module

[f-f]

These two commands do basically the same thing but have different enough names to be confusing.

So we should rename them to something clearer. Proposals:

1. spago bundle-app, spago bundle-module
2. spago bundle app spago bundle module
3. spago bundle defaults to "app" mode, and the module functionality is behind a flag spago bundle --module

[FintanH]

My vote would be 2. 👍 👍

[FintanH]

--main it to specify the main module that gets exposed (either to run or to export)

So I understand you're pointing to the --main module but it seems like a strange mnemonic to me for bundling a module. Does the module have to be a module Main?

[f-f]

@FintanH it doesn't have to be, but I hear you that this flag might be misnamed. If you do spago bundle --help, it gets a bit clearer as it tells you what it is for:

-m,--main MAIN           The main module to bundle

However, this same flag is --module in purs, so I'd support renaming it to --module here too

[FintanH]

The main module to bundle

I think that's still ambiguous because it says "main" 😄

--module is good, my only gripe is that it's repetitive if we go down the route of spago bundle module. But I have no better alternative 👍