MTBR-691 refactor C++-related code from Journal::Stream::Impl to allow journals in other languages (#3)

Fix a bug where the Journal can be turned on before the stream pointer is initialized, resulting in a failure to output and memory leaks

Ensure Journal stream is always flushed when `\n` is printed

* Add the Journal sources
* Remove ReForm specific code in Journal and allow various configuration options
* Fix a macro that was incorrect if JOURNAL_ON was undefined
* Journal can work either with Boost or the std::experimental filesystem implementations
* OStringStream using std::ostringstream now and sets the locale to "C"
* Debug::FIle now uses OStringStream
* Add IOutputStream:Base::print(float)
* Fix initialization bugs
* Allow comment streaming, allow existing journal entries to be output as comments, improve code consistency
* Document the Journal functions
* Add Journal::output_path()

Flush the test stream after each result output to make sure results are not lost in the event of a crash

* Remove boost dependency
* Make the CMakeLists.txt reusable
* Add more configuration options and remove ReForm-specific defaults
* Clean up the File interface and implementation
* Clean up definitions of helper and stream functions
* Use the configured print function for debug output to the console instead of streaming to std::cerr
* Clean up the File flags and HTML support (unused)
* Simplify File and Config to avoid deallocations on app shutdown
* Update (C) notices, clean up code
* Add the macro DEB_if() to simplify the DEB_if_*() macro implementations

Tristan Barback authored Jul 30, 2018 and Martin Marinov committed Jul 30, 2018

* Add new warning guard macro for CQI: add a completely new macro rather than using
   the existing one as this will let us customise the behaviour without
   breaking any of the existing warning suppressions. In particular the
   warning level can be set to 3 even for the problem header files.

* Add unused variable macro.

* Minor whitespace correction

Change BaseDefines.hh to only export symbols if BASEDLL is defined (same behavior as Windows) to allow building Base as static library without exposing its symbols

Disable BASE_THREAD_LOCAL on all platforms: The thread_local variable initialization behavior is difficult to support downstream, and is causing bugs when using Progress::Node.

Add an user-friendly node name as a parameter tp PROGRESS_DEFINE_NODE and PROGRESS_DEFINE_NODE_CUSTOM.

Set the number of done children of Progress::Node in Context::entry_node() instead of Context::exit_node() to report the correct completed stage number while the child node is active.