[DF-4152] Fixed resource leak in Thread. Win32 only
[DF-4152] Intermediate commit
[DF-4152] Intermediate commit
[DF-4152] Intermediate commit
Merge branch 'thread-leak' of https://github.com/dava/dava.framework into thread-leak

Conflicts:
	Sources/Internal/Platform/ThreadWin32.cpp
[DF-4152] Added PosixThread
Merge branch 'development' into thread-leak

Conflicts:
	Sources/Internal/Job/Job.cpp
	Sources/Internal/Job/Job.h
	Sources/Internal/Job/JobManager.cpp
[DF-1785] Test project for color picker
[DF-1785] Color picker widget prototype
[DF-1785] Expander widget experiments
[DF-1785] Color picker refactoring
[DF-1785] Implementation of color editor sub widgets
[DF-1785] Slider control; Qt mouse grabber
[DF-1785] Gradient slider implementation
[DF-1785] Gradient slider mouse support
[DF-1785] Fixed arrow drawing
[DF-4558] Main changes.
[DF-1785] slider implementation
[DF-1785] Fixed slidep positioning bugs
[DF-1785] Impovements