lib: add option `archived` to `/targets` service
lib: add server-configuration to `Configuration`
lib: add 3 options to servers' configuration
lib: add daemonization of the server
lib: listen on the “command pipe” (`Server`)
build: make a “test-environment” in `please.sh`
lib: fix `EDSL.run` (was missing env-variables)
test: make “CLI” test not override configuration
doc: add `http_api.md` (for now usage examples)
lib: make sure `/targets` replies only on `GET`
doc: update `http_api.md`