amqp_<filename> is used in at least two other C/C++ projects related
to amqp, so this commit changes all our source to use a qamqp header.
This avoids potential clashes, and is more in line with Qt style
QAMQP::Frame used to be public API mostly for MessageProperties. There
is no longer a need to keep this API public, as it should all be wrapped
with the cleaner Message/Queue/Exchange/Client API set
most of these are included in the manual amqp test already, but I wanted
to break them out so users could have a nice example of how to do these
in standalone form, like the python tutorials. Helloworld (tutorial 1) is
also included fully implemented in this commit
Matt Broadstone