exceptions: Make Tlv::Error a base class for all packet-processing exceptions

This commit also includes a number of code style fixes.

Change-Id: I44f83915e733b43d5f43b4266902c8262e928d91
Refs: #1528
diff --git a/src/management/ndnd-forwarding-flags.hpp b/src/management/ndnd-forwarding-flags.hpp
index 803dabc..36a565f 100644
--- a/src/management/ndnd-forwarding-flags.hpp
+++ b/src/management/ndnd-forwarding-flags.hpp
@@ -19,7 +19,8 @@
  * a registered prefix.  We use a separate ForwardingFlags object to retain future compatibility if the daemon forwarding
  * bits are changed, amended or deprecated.
  */
-class ForwardingFlags {
+class ForwardingFlags
+{
 public:
   /**
    * Create a new ForwardingFlags with "active" and "childInherit" set and all other flags cleared.