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/WebApp.hs

@@ -37,10 +37,10 @@ import Control.Concurrent.STM
 import Network.Socket (HostName)
 import System.Environment (getArgs)
 
-cmd :: [Command]
-cmd = [ withOptions [listenOption] $
+cmd :: Command
+cmd = withOptions [listenOption] $
 	noCommit $ noRepo startNoRepo $ dontCheck repoExists $ notBareRepo $
-	command "webapp" paramNothing seek SectionCommon "launch webapp"]
+	command "webapp" paramNothing seek SectionCommon "launch webapp"
 
 listenOption :: Option
 listenOption = fieldOption [] "listen" paramAddress