feat(miniooni): make CLI much more user friendly (#913)

Part of https://github.com/ooni/probe/issues/2184, because I wanted
to allow swapping commands and options more freely.

As a side effect, this PR closes https://github.com/ooni/probe/issues/2248.

AFAICT, every usage that was legal before is still legal. What has
changed seems the freedom to swap commands and options and a much
better help that lists the available options.

internal/cmd/miniooni/consent.go

@@ -13,7 +13,7 @@ import (
 
 // acquireUserConsent ensures the user is okay with using miniooni. This function
 // panics if we do not have acquired the user consent.
-func acquireUserConsent(miniooniDir string, currentOptions Options) {
+func acquireUserConsent(miniooniDir string, currentOptions *Options) {
 	consentFile := path.Join(miniooniDir, "informed")
 	err := maybeWriteConsentFile(currentOptions.Yes, consentFile)
 	runtimex.PanicOnError(err, "cannot write informed consent file")