Move msvcstub.h header to common dir
Add WinUtils.{hpp,cpp} files with Win32-helper functions
Add WinDXUtils.{hpp,cpp} files with DX-helper functions
Extract small functions for every BufferFormat from calculateAvgColor()
Set TimeredGrabber class to use QScopedPointer to hold QTimer
Set X11Grabber class use QScopedPointer to hold X11GrabberData
Fix resource handling in WinAPIGrabber class
Set D3D9Grabber class use QVector to hold BYTE array
Refactoring of the D3D10Grabber class

- Make internal class D3D10GrabberImpl and move it to cpp.
  This allows us to hide inplementation details from header.
- Set D3D10GrabberImpl class to use smart pointers to hold resources.
- Use WinDXUtils module instead of local DX-helper functions.
Fix grab.pro file
Fix WinAPIGrabberEachWidget class
Final fixes for grab project