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/Wanted.hs

@@ -17,7 +17,7 @@ import Types.StandardGroups
 
 import qualified Data.Map as M
 
-cmd :: [Command]
+cmd :: Command
 cmd = cmd' "wanted" "get or set preferred content expression" 
 	preferredContentMapRaw
 	preferredContentSet
@@ -27,8 +27,8 @@ cmd'
 	-> String
 	-> Annex (M.Map UUID PreferredContentExpression)
 	-> (UUID -> PreferredContentExpression -> Annex ())
-	-> [Command]
-cmd' name desc getter setter = [command name pdesc seek SectionSetup desc]
+	-> Command
+cmd' name desc getter setter = command name pdesc seek SectionSetup desc
   where
 	pdesc = paramPair paramRemote (paramOptional paramExpression)