The explicitly defaulted or implemented move constructors and assignment
operators are made "noexcept".
Bugfix:
* src/stream.cpp Stream::Stream() char_traits::int_type intro[4] is
now aggregate-initialized (to zero) to avoid UB.
Minor changes:
* Using std::isinf() and std::signbit() instead of comparing for
equality with infinity.
* src/streamcharsource.h: Added #include "stream.h".
* src/stream.h: Forward declaring "class StreamCharSource".
* Some implicit casting changed into static_cast's.
Signed-off-by: Ted Lyngmo <ted@lyncon.se>
