also going back to using the engine include for a while, for some testing.

Create a new hidden provision-install-backend command, that we call during provision-install, so we can isolate php errors and recover from them. should also help with OOM errors.

when a platform root is no longer found, check if it has an associated makefile and fetch automatically. #373062

Replace the @server_localhost with @server_master, which now has the ability to have a remote_host other than localhost.

Moved the environment hiding logic to the config files process method, and have the http service OPT IN to use the cloaking.

Migration between servers works. It now deletes the vhost file first, and if it gets recreated that's cool.

Only create the local include_path when verifying the local server, and only synch it when verifying a remote server.

the singular filesystem object now.

Sync is now a method of the server class, with a helpful method associated
to the services that redirect to the service's server.

Sort of fix site import, which also verifies now. Introduce d()->site_path instead of concatenating everywhere.

a separate task.

Add some "noop" implementations in the remote file class, to test a db only remote server. The issue was that the user account on the remote server wasnt the same. Neither were the paths

had to make a nasty hack to step around drush internals because site aliases
put stuff in the options context that dont come from the command line options.

Removed the provision_service function, and introduce service handler subscriptions in the environment objects.

Instead of provision_service('type') you now use d()->service('type') to access the service object.
The context object returned by d() now manages which context object's service to return, based
on the internally managed subscriptions.

stop the generation of drushrc.php when a site context is being saved.