Apply formatting/style tweaks to comply with compile time diagnostics for g++ and clang++ (#686)

* Add compilation flags: -Wshadow -Weffc++ -pedantic -pedantic-errors
* Delete implicit copy & move constructors & assignment operators
  in classes with pointer data members.
* An exception to the above: Add default copy & move constructors &
  assignment operators for the Binary class.
* Convert boolean RegEx operators to binary operators.
* Initialize all members in all classes in ctors.
* Let default ctor delegate to the converting ctor in
  Binary and RegEx
* Don't change any tests except regex_test (as a result of the change
  to binary operators).

Note: https://bugzilla.redhat.com/show_bug.cgi?id=1544675 makes
-Weffc++ report a false positive in "include/yaml-cpp/node/impl.h".

src/streamcharsource.h

@@ -7,7 +7,6 @@
 #pragma once
 #endif
 
-#include "yaml-cpp/noncopyable.h"
 #include <cstddef>
 
 namespace YAML {
@@ -16,6 +15,9 @@ class StreamCharSource {
   StreamCharSource(const Stream& stream) : m_offset(0), m_stream(stream) {}
   StreamCharSource(const StreamCharSource& source)
       : m_offset(source.m_offset), m_stream(source.m_stream) {}
+  StreamCharSource(StreamCharSource&&) = default;
+  StreamCharSource& operator=(const StreamCharSource&) = delete;
+  StreamCharSource& operator=(StreamCharSource&&) = delete;
   ~StreamCharSource() {}
 
   operator bool() const;
@@ -27,8 +29,6 @@ class StreamCharSource {
  private:
   std::size_t m_offset;
   const Stream& m_stream;
-
-  StreamCharSource& operator=(const StreamCharSource&);  // non-assignable
 };
 
 inline StreamCharSource::operator bool() const {
@@ -43,6 +43,6 @@ inline const StreamCharSource StreamCharSource::operator+(int i) const {
     source.m_offset = 0;
   return source;
 }
-}
+}  // namespace YAML
 
 #endif  // STREAMCHARSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66