This is a partial migration of https://github.com/openmaptiles/openmaptiles/pull/785
* Use `import-data` instead of `import-lakelines`, `import-water`, and `import-natural-earth`
* Upgrade docker-compose.yml to version 2.3 (allows some extra env var usage in yaml file itself)
* Remove `openmaptiles-tools:latest` usage -- no longer needed, can use current version 4.1
* `db-start` does not do a container recreation in case docker-compose.yml definition has changed.
* a few minor cleanups in quickstart.sh
