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/PreCommit.hs

@@ -28,11 +28,12 @@ import qualified Git.LsFiles as Git
 
 import qualified Data.Set as S
 
-cmd :: [Command]
-cmd = [command "pre-commit" paramPaths seek SectionPlumbing
-	"run by git pre-commit hook"]
+cmd :: Command
+cmd = command "pre-commit" paramPaths SectionPlumbing
+	"run by git pre-commit hook"
+	(commandParser seek)
 
-seek :: CommandSeek
+seek :: CmdParams -> CommandSeek
 seek ps = lockPreCommitHook $ ifM isDirect
 	( do
 		-- update direct mode mappings for committed files