Windows: Support long filenames in more (possibly all) of the code

Works around this bug in unix-compat:
https://github.com/jacobstanley/unix-compat/issues/56
getFileStatus and other FilePath using functions in unix-compat do not do
UNC conversion on Windows.

Made Utility.RawFilePath use convertToWindowsNativeNamespace to do the
necessary conversion on windows to support long filenames.

Audited all imports of System.PosixCompat.Files to make sure that no
functions that operate on FilePath were imported from it. Instead, use
the equvilants from Utility.RawFilePath. In particular the
re-export of that module in Common had to be removed, which led to lots
of other changes throughout the code.

The changes to Build.Configure, Build.DesktopFile, and Build.TestConfig
make Utility.Directory not be needed to build setup. And so let it use
Utility.RawFilePath, which depends on unix, which cannot be in
setup-depends.

Sponsored-by: Dartmouth College's Datalad project

Annex/Content/PointerFile.hs

@@ -22,6 +22,8 @@ import Utility.Touch
 import qualified System.Posix.Files as Posix
 #endif
 
+import System.PosixCompat.Files (fileMode)
+
 {- Populates a pointer file with the content of a key. 
  -
  - If the file already has some other content, it is not modified.
@@ -53,12 +55,11 @@ populatePointerFile restage k obj f = go =<< liftIO (isPointerFile f)
  - Does not check if the pointer file is modified. -}
 depopulatePointerFile :: Key -> RawFilePath -> Annex ()
 depopulatePointerFile key file = do
-	let file' = fromRawFilePath file
-	st <- liftIO $ catchMaybeIO $ getFileStatus file'
+	st <- liftIO $ catchMaybeIO $ R.getFileStatus file
 	let mode = fmap fileMode st
 	secureErase file
 	liftIO $ removeWhenExistsWith R.removeLink file
-	ic <- replaceWorkTreeFile file' $ \tmp -> do
+	ic <- replaceWorkTreeFile (fromRawFilePath file) $ \tmp -> do
 		let tmp' = toRawFilePath tmp
 		liftIO $ writePointerFile tmp' key mode
 #if ! defined(mingw32_HOST_OS)