This includes a cleanup of the specialized configuration header
files, as supported features are detected during the configuration
stage and do not need to be hard coded into the headers for different
platforms.

Change-Id: I40e26aa1846838d20badda82c40bfd002340ba80
Signed-off-by: Bernhard Sessler <bernhard.sessler@corscience.de>
Reviewed-on: https://gerrit.libreoffice.org/7113
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

include/cppunit/portability/config-msvc6.h:
* include/cppunit/portability/Portability.h: Added macro 
CPPUNIT_UNIQUE_COUNTER on MSVS 7.0+ using __COUNTER__ to
fix bug #2031696.

* include/cppunit/TestResultCollector.h
* src/cppunit/TestResultCollector.cpp: fixed memory leak
occuring when calling reset().

* src/cppunit/DllMain.cpp: added work-around for mingw compilation
for BLENDFUNCTION macro issue when including windows.h.

* src/qttestrunner/TestRunnerDlgImpl.cpp: fixed display of multiline
messages.

* include/cppunit/Portability.h: better integration of compiler output
for gcc on Mac OS X with Xcode (contributed by Claus Broch).

include/cppunit/Portability.h: moved OStringStream alias definition to
Portability/Stream.h. User need to define EVC4 to indicate that
config-evc4.h should be used. (how to we detect this automatically ?).
Notes that this means it might be needed to add #include <string> to some
headers since its no longer included by Portability.h.

* include/cppunit/Portability/Stream.h: define alias OStringStream, stdCOut(),
and OFileStream. If CPPUNIT_NO_STREAM is defined (evc4 config), then provides
our own implementation (based on sprintf and fwrite).

* include/cppunit/config/config-evc4.h: config file for embedded visual c++ 4.
Still need to detect for this platform in Portability.h (currently relying on
EVC4 being defined...)

* *.[cpp/h]: most source files have been impacted with the following change:
#include <iostream> -> #include <cppunit/Portability/Stream.h>
std::ostream -> CPPUNIT_NS::OStream
std::ofstream -> CPPUNIT_NS::OFileStream
std::cout -> CPPUNIT_NS::stdCOut()
std::endl -> "\n"
Also, code using std::cin as been defined out if CPPUNIT_NO_STREAM was defined.
The exact list of impact files can be obtain in CVS using tags:
TG_CPPUNIT_NO_STREAM_BEFORE & TG_CPPUNIT_NO_STREAM_AFTER.

include/cppunit/Portability.h:
* include/cppunit/plugin/TestPlugIn.h: fixed report compilation issue
with mingw & cygwin. WIN32 is now always defined if _WIN32 is defined.
Bug #945737 & #930338.