remove 3 build flags

* Removed the webapp-secure build flag, rolling it into the webapp build
  flag.
* Removed the quvi and tahoe build flags, which only adds aeson to
  the core dependencies.
* Removed the feed build flag, which only adds feed to the core
  dependencies.

Build flags have cost in both code complexity and also make Setup configure
have to work harder to find a usable set of build flags when some
dependencies are missing.

Utility/WebApp.hs

@@ -31,10 +31,8 @@ import Blaze.ByteString.Builder.Char.Utf8 (fromText)
 import Blaze.ByteString.Builder (Builder)
 import Control.Arrow ((***))
 import Control.Concurrent
-#ifdef WITH_WEBAPP_SECURE
 import Data.SecureMem
 import Data.Byteable
-#endif
 #ifdef __ANDROID__
 import Data.Endian
 #endif
@@ -77,11 +75,7 @@ runWebApp tlssettings h app observer = withSocketsDo $ do
 	sockaddr <- fixSockAddr <$> getSocketName sock
 	observer sockaddr
   where
-#ifdef WITH_WEBAPP_SECURE
 	go = (maybe runSettingsSocket (\ts -> runTLSSocket ts) tlssettings)
-#else
-	go = runSettingsSocket
-#endif
 
 fixSockAddr :: SockAddr -> SockAddr
 #ifdef __ANDROID__
@@ -165,25 +159,13 @@ webAppSessionBackend _ = do
 		Just . Yesod.clientSessionBackend key . fst
 			<$> Yesod.clientSessionDateCacher timeout
 
-#ifdef WITH_WEBAPP_SECURE
 type AuthToken = SecureMem
-#else
-type AuthToken = T.Text
-#endif
 
 toAuthToken :: T.Text -> AuthToken
-#ifdef WITH_WEBAPP_SECURE
 toAuthToken = secureMemFromByteString . TE.encodeUtf8
-#else
-toAuthToken = id
-#endif
 
 fromAuthToken :: AuthToken -> T.Text
-#ifdef WITH_WEBAPP_SECURE
 fromAuthToken = TE.decodeLatin1 . toBytes
-#else
-fromAuthToken = id
-#endif
 
 {- Generates a random sha2_512 string, encapsulated in a SecureMem,
  - suitable to be used for an authentication secret. -}