Removed some ref-qualified accessors from wrappers

Rvalue qualified accessors like dart::basic_object::get() &&
allowed users to circumvent invariants of the strongly typed API

Updated cmake project version to 1.3.0

Fixed an issue around unterminated input strings

In the rapidjson parser

Fixed a version issue in the CMakeLists.txt

Added a fuzz-tested buffer validation API

Intended use case for dart::is_valid and dart::validate
is to enable interacting with buffers from untrusted sources

Added dart::packet::as and dart::packet::maybe_as

To centralize cast operations with explicit syntax

Promoted to version 1.0.0

Updated a few images and made some very small API refinements