Move declaration of IVideoCapture class into precomp.hpp, make some methods of IVideoCapture pure virtual

v4l2_scan_controls_enumerate_menu is unused and causes ioctl error on
RaspberryPi and possibly other Video4Linux variants. See
http://www.raspberrypi.org/forum/viewtopic.php?f=43&t=65026 for more
detail.

Remove implementation of CvCapture interface for Intel PerC camera. Add IVideoCapture interface and implementation of this one for Intel PerC camera

Last changes in test leads to SIGKILL on Android.
SIGKILL is called by out of memory killer.

AVCaptureVideoPreviewLayer setOrientation is depricated. This fixes the warning and provides backward compatibility.

Use correct integer types for arguments to TIFFGetField to avoid corruption
of values and failed loads of TIFF file when using cv::imread().

Added test where both big and little endian TIFF files are read using imread().

Fixed build of 3rdparty libtiff on big endian hosts.

Reduced memory required during decode_tile16384x16384 test by not converting
large grayscale test image to color image during read.

Useless output to console fixed;
Test output files moved from cwd to temp folder.

To be used in the mouse callback like this:
    if (CV_EVENT_MOUSEWHEEL == CV_GET_MOUSEWHEEL_EVENT(event))
    {
       int delta= CV_GET_WHEEL_DELTA(event);
       // use delta...
    }

Small fix for extracting mouse coordinates on Windows, in a way that will always work with multiple monitors.
This is the way recommended by Microsoft.

Added "PVAPI_" prefix to FrameStartTriggerMode definition

Also deleted miscellaneous remaining multimon cruft.
Deleted #include <winuser.h>, because <windows.h> includes it
already.

This should have a nice side effect of preventing us from
accidentally using any Windows API that's too new.