Remove obsolete ddev plugins

[rfay]

The Problem:

We are abandoning all plugins except the plugin formerly known as 'local' at this time. This removes them.

The Fix:

Remove them, change names, remove newmedia, temporarily disengage tests by renaming the files.

Related Issue Link(s):

Remove legacy and drudapi plugins

Release/Deployment notes:

Does this affect anything else, or are there ramifications for other code? Does anything have to be done on deployment?

Several TODOs are in the code -

• Add tests back in when the local plugin is stable. This is critical because most tests are now removed.
• Fix the environment specifiers when we remove environment config "ActiveApp" and "ActiveDeploy"
• Temporary config hack doesn't read the drud.yaml, and we don't expect to - all it does is default to the values given on the command line, and uses a wired-in workspace dir (~/.drud)

Code Review

This is hard to review so I split it into 3 commits.

• 4faf323 removes a whole pile of obsolete files. It's easier if you don't look at that, maybe just review the filenames that are being reviewed.
• 8e5b845 has all the logic changes. Most of your attention should be there.
• b9d6252 mostly just puts tests out of the way temporarily

Manual Testing

The "-p local" argument is no longer necessary with this PR. That's the only platform plugin remaining and it's the default.

The split of "add" into "start" and "import" is not in this PR, so this uses the traditional "add" subcommand.

1. ddev add <sitename> <environment> (fails, but creates dirs in ~/.drud/local). Example: ddev add drud-d8 production
2. Copy newmedia-style archive tarball into ~/.drud/local but rename it to <environment>-<sitename>.tar.gz
3. Untar newmedia-style archive tarball into ~/.drud/local/-/src
4. Rerun ddev add <sitename> <environment, Example: ddev add drud-d8 production (should work this time)
5. Visit the site, optionally log in, etc.
6. Try the other commands on the site: list, start, stop, restart, ssh, version

[tannerjfco]

Code changes all look good here. I manually tested all commands and they seem to work as expected.

[rfay]

Added manual testing instructions.

[beeradb]

big huge +💯