feat(summer): help, examples and hints for every tool command

- build runs go build under a spinner on a terminal and ends with
  'Built bin/<name> in <time>'; make:* print 'Created <path>' per file
- make:*, plugin:add, new, parity:*, docs:build, docs:sync and every
  delegate get long help and examples; delegates note that global options
  pass through to the application binary
- make:* failures (no summer.yaml, invalid plugin ID or name, existing
  artifact, unknown plugin) explain themselves and suggest a command
- docs:build and docs:sync return bonfire.Reported after the problem list
- TestCommandsDocumented covers the tool commands too
- docs: Upgrading to 0.4, delegates and global options, make: results and
  hints, the checklist for a finished command

docs/console/setup-and-maintenance.md

@@ -101,7 +101,7 @@ SummerCMS acme v1.4.0 (framework v0.4.0)
 
 The database line shows the host, port and database name, never the user or password. Pending migrations read `3 pending — run bin/acme migrate`. The admin line shows the admin URL, or `off` with the steps to add an admin controller; a warning naming `summer admin:create` follows when the `backend_users` table is empty. `-v` adds one line per plugin with the plugins it requires and its pending migrations, and lets every component's info logs through; `-q` prints no summary, only warnings and errors.
 
-Off a terminal (systemd, Docker, a redirected log) nothing is printed on stdout: the same facts are logged as one `startup summary` record and one record whose message is exactly `listening on <addr>`, both from the `serve` component, so journald and the daily files keep them and scripts can wait for the second one. On a terminal the two records still reach the daily files, but the console does not repeat them.
+Off a terminal (systemd, Docker, a redirected log) nothing is printed on stdout: the same facts are logged as one `startup summary` record and one record whose message is exactly `listening on <addr>`, both from the `serve` component, so journald and the daily files keep them and scripts can wait for the second one. On a terminal the console does not repeat the two records after the block; a file channel whose level lets Info through still gets them (the default daily channel keeps only warnings and errors).
 
 ### Shutting down