started converting to use optparse-applicative

This is a work in progress. It compiles and is able to do basic command
dispatch, including git autocorrection, while using optparse-applicative
for the core commandline parsing.

* Many commands are temporarily disabled before conversion.
* Options are not wired in yet.
* cmdnorepo actions don't work yet.

Also, removed the [Command] list, which was only used in one place.

Command/GCryptSetup.hs

@@ -13,12 +13,13 @@ import Annex.UUID
 import qualified Remote.GCrypt
 import qualified Git
 
-cmd :: [Command]
-cmd = [dontCheck repoExists $ noCommit $
-	command "gcryptsetup" paramValue seek
-		SectionPlumbing "sets up gcrypt repository"]
+cmd :: Command
+cmd = dontCheck repoExists $ noCommit $
+	command "gcryptsetup" paramValue
+		SectionPlumbing "sets up gcrypt repository"
+		(commandParser seek)
 
-seek :: CommandSeek
+seek :: CmdParams -> CommandSeek
 seek = withStrings start
 
 start :: String -> CommandStart