Add a --fluffy-blocks option to relay blocks as fluffy blocks

Defaults to off, but fluffy blocks are forced enabled on testnet

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -1622,7 +1622,7 @@ skip:
     {
       if (peer_id && exclude_context.m_connection_id != context.m_connection_id)
       {
-        if(m_core.get_testnet() && (support_flags & P2P_SUPPORT_FLAG_FLUFFY_BLOCKS))
+        if(m_core.fluffy_blocks_enabled() && (support_flags & P2P_SUPPORT_FLAG_FLUFFY_BLOCKS))
         {
           LOG_DEBUG_CC(context, "PEER SUPPORTS FLUFFY BLOCKS - RELAYING THIN/COMPACT WHATEVER BLOCK");
           fluffyConnections.push_back(context.m_connection_id);