[DF-598] dpi identification for ios and mac os
[DF-598] DPI determination for ios
[DF-598] Fix for retina
[DF-598] small refactoring in win32's part
[DF_598] add unittest with UI for DPI detection
[DF-598] review refactoring(win part)
Merge remote-tracking branch 'origin/DF-598_get_dpi' into DF-598_get_dpi
[DF-598] review refactor (ios, mac os)
[DF-598] refactoring for win projects
Merge remote-tracking branch 'origin/DF-598_get_dpi' into DF-598_get_dpi
[DF-598] fix wrong ipad mini value
fix Guard
Merge remote-tracking branch 'origin/DF-598_get_dpi' into DF-598_get_dpi
fix guard