Upgrade to tools v5 - rm import-osm, new downloader... (#785)

Update to tools v5. See https://github.com/openmaptiles/openmaptiles-tools/releases/tag/v5.0.0 for the list of all changes. Other OMT-repo specific changes:

* removes `import-osm` docker usage, replacing it with `openmaptiles-tools`
* quickstart builds faster because it uses postgres with preloaded water, natural earth, and lake centerlines tables.

### Makefile targets
* `tools-dev` will open a shell in a docker to experiment and debug (instead of `import-sql-dev` and `import-osm-dev`)
* separated `start-maputnik` from `start-postserve`
* renamed `clean-docker` into `db-destroy` to make it more explicit
* cleaner `db-start`, `db-stop`, `db-destroy` targets
* `db-start-preloaded` is the same as `db-start`, except that it uses `postgis-preloaded` -- an image with preloaded water, natural-earth, and lake centerline data
* `db-start` will not recreate the container if it already exists -- this way if it was started as preloaded, it will not be rebuilt.
* better output messages

### Quickstart
* uses `postgis-preloaded` image by default to make quickstart quicker.  To start with a clean db, pass 2 parameters to quickstart, e.g. `./quickstart.sh albania empty`

UPDATE.md

@@ -15,7 +15,7 @@ the OSM change feed and import it into the database.
 After each run you should also have a list of tiles that have updated.
 
 ```
-docker-compose run update-osm
+make update-osm
 ```
 
 ### Import Change File
@@ -23,7 +23,7 @@ docker-compose run update-osm
 Given you have a file `changes.osc.gz` in your import folder. Once you ran the import command you should also have a list of tiles that have updated.
 
 ```
-docker-compose run import-osm-diff
+make import-diff
 ```
 
 ## Generate Changed Tiles