Fixes #2528: Remove make.

[grasmash]

Leaving this here as a place holder. WIP and not ready to merge.

Todo:

• Audit remaining make code with a code metrics tool to identify unused methods
• Refactor tests
• Modify make-convert command so that it uses D.O packagist and accompanying version constraints.
• Audit make-convert command for deprecated functions

[grasmash]

@weitzman

If we're going to continue supporting make-convert, then we need to support parsing ini files. That entails supporting make includes, recursive make files, remotely-hosted make files, etc.

There's a whole slew of functionality associated with parsing the various things that might be found in a make file.

Where do we draw the line? We could greatly simplify the codebase if we, for instance, said that we weren't going to support remote make file references.

[weitzman]

Could folks use Drush8 to generate a lock file and then we convert that? That way we remove remote support. Or maybe enhance make-convert in 8.x and then we don't have to ship any make at all in Drush9?

[DocDJ]

Why would you want to remove remote support as opposed to leaving it up to the sys-admin? Live long & prosper, Dennis

[weitzman]

I went with my last proposal. Folks can use make in Drush8 and convert using its make-convert when they are ready. See #2644