WITH_WINRT -> ENABLE_WINRT_MODE;
Some temporary char* replaced with Ptr<char>;
Build fix for regular WIN32;
Windows Platform SDK and MSVC search added to cmake;
Warinig fixes.

Additional CMAKE flag WITH_WINRT added.

- Used lunix style slashes - works on most systems
- Removed all trailing whitespaces

Since commit d8417af0 (July 2011) cv::compare produces an array with
the same size and type as the input arrays.
Signed-off-by: Michael Hanselmann <public@hansmi.ch>

adding/tuning multiple run for perf tests failing due to big deviation (functions using TBB can work so)

Also, removed needless check of BUILD_SHARED_LIBS in core; in that case,
only the current module's library type matters.