src: Improving consistency and correcting code style

As of this commit, all data structures can be directly constructed from
wire format.

This commit excludes full correction of code style in security/ and
tools/ndnsec*, which will be part of a different commit.

Change-Id: I121ac1f81948bc7468990df52cdefeb2988d91a1
Refs: #1403
diff --git a/src/security/signature-sha256.hpp b/src/security/signature-sha256.hpp
index 11b7cdf..8ef37a8 100644
--- a/src/security/signature-sha256.hpp
+++ b/src/security/signature-sha256.hpp
@@ -25,7 +25,7 @@
     m_info.push_back(nonNegativeIntegerBlock(Tlv::SignatureType, Tlv::DigestSha256));
   }
 
-  SignatureSha256(const Signature &signature)
+  SignatureSha256(const Signature& signature)
     : Signature(signature)
   {
     if (getType() != Signature::Sha256)