Refactor initialization

- add device constructor that accepts FairMQProgOptions object.
 - Initialize config values in INIT state (to allow their update).
 - Simplify FairMQProgOptions handling in FairMQDevice.
 - Simplify SetTransport/SetConfig - refactor duplicated code.
 - Add FairMQDevice methods to add channels.

fairmq/options/FairMQProgOptions.h

@@ -162,6 +162,11 @@ class FairMQProgOptions
     int PrintOptions();
     int PrintOptionsRaw();
 
+    void AddChannel(const std::string& channelName, const FairMQChannel& channel)
+    {
+        fFairMQChannelMap[channelName].push_back(channel);
+    }
+
   private:
     struct ChannelKey
     {