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/Direct.hs

@@ -15,10 +15,10 @@ import qualified Git.Branch
 import Config
 import Annex.Direct
 
-cmd :: [Command]
-cmd = [notBareRepo $ noDaemonRunning $
+cmd :: Command
+cmd = notBareRepo $ noDaemonRunning $
 	command "direct" paramNothing seek
-		SectionSetup "switch repository to direct mode"]
+		SectionSetup "switch repository to direct mode"
 
 seek :: CommandSeek
 seek = withNothing start