Remove the server warnings

[AlexITC]

While compiling the server project, there are some warnings which can be removed, any warning removed helps:

[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
[info] Compiling 14 Scala sources and 1 Java source to /home/dell/projects/mine/cryptochat/server/target/scala-2.12/classes ...
[warn]  [E1] app/controllers/ChannelsController.scala
[warn]       private val messageFormat in object ChannelsController is never used
[warn]       L38:  private implicit val messageFormat: Format[Message] = wrapperFormat[Message, Base64String](Message.apply, _.base64)
[warn]       L38:                       ^
[warn]  [E2] app/controllers/ChannelsController.scala
[warn]       private val channelNameFormat in object ChannelsController is never used
[warn]       L57:  private implicit val channelNameFormat: Format[Channel.Name] = safeWrapperFormat[Channel.Name, String](Channel.Name.from, _.string)
[warn]       L57:                       ^
[warn]  [E3] app/controllers/ChannelsController.scala
[warn]       private val channelSecretFormat in object ChannelsController is never used
[warn]       L58:  private implicit val channelSecretFormat: Format[Channel.Secret] = wrapperFormat[Channel.Secret, String](Channel.Secret.apply, _.string)
[warn]       L58:                       ^
[warn]  [E4] app/controllers/ChannelsController.scala
[warn]       private val peerFormat in object ChannelsController is never used
[warn]       L60:  private implicit val peerFormat: Format[Peer] = new Format[Peer] {
[warn]       L60:                       ^
[warn]  [E5] conf/routes
[warn]       Unused import
[warn]  [E6] conf/routes
[warn]       Unused import
[warn]  [E7] conf/routes
[warn]       Unused import
[warn] app/controllers/ChannelsController.scala: L38 [E1], L57 [E2], L58 [E3], L60 [E4]