build: Fixing and suppressing all warnings

clang generates a number of harmless warnings originated from cryptopp
library.

Change-Id: I676e7b6d60588867f55a2ce1cd88ef263c3e38df
binary-xml-wire-format: Partial enabling of binary-xml-wire-format

Due to significant changes, Data abstraction conversion (from and to
wire format) is currently disabled, using empty placeholders instead.

Other data structures should have working conversion (minus
PublisherPublicKeyDigest, which is not part of Interest and
ForwardingEntry data structure anymore).

Change-Id: I51c47495808c35b500fc6b1fcc0c46db217e6598