swarm: compress avatar to send in conversation's request

As it's sent over the DHT, the max value is 64k, also, even if sent
as a SIP message (if member was already connected and we add a new
non 1:1 swarm with this contact), the sendSIPMessage will fail due
to a too large message (PJSIP_EMSGTOOLONG).

Change-Id: I7908809fe2c3f6e08f9a4b9c6f8aac654ab86c42

src/libclient/authority/storagehelper.cpp

@@ -206,8 +206,6 @@ getContactInteractionString(const QString& authorUri, const api::interaction::St
 }
 
 namespace vcard {
-QString compressedAvatar(const QString& image);
-
 QString
 compressedAvatar(const QString& image)
 {

src/libclient/authority/storagehelper.h

@@ -73,6 +73,8 @@ QString getContactInteractionString(const QString& authorUri,
 
 namespace vcard {
 
+QString compressedAvatar(const QString& image);
+
 /**
  * Build the vCard for a profile
  * @param profileInfo

src/libclient/conversationmodel.cpp

@@ -986,7 +986,11 @@ ConversationModel::createConversation(const VectorString& participants, const Ma
 void
 ConversationModel::updateConversationInfos(const QString& conversationId, const MapStringString info)
 {
-    ConfigurationManager::instance().updateConversationInfos(owner.id, conversationId, info);
+    MapStringString newInfos = info;
+    // Compress avatar as it will be sent in the conversation's request over the DHT
+    if (info.contains("avatar"))
+        newInfos["avatar"] = storage::vcard::compressedAvatar(info["avatar"]);
+    ConfigurationManager::instance().updateConversationInfos(owner.id, conversationId, newInfos);
 }
 
 bool