(svn r9006) [cpp_gui] -Add: Label widget (MiHaMiX)

(svn r9004) [cpp_gui] -Sync with trunk (r8900..r9003)

(svn r8998) [cpp_gui] -Fix(r8997): some obscure g++ warnings about base/member initialization order (glx)

(svn r8997) [cpp_gui] -Codechange: common window features are now controlled by FeatureFlags enum.
-Caption bar, close box and resize box are created automatically depending on features specified in window ctor.

(svn r8996) [cpp_gui] -Add: CloseBox added into CaptionBar
-Add: when pressing gui button and holding the mouse button down you can now move mouse out of the button and it will get released silently. So if you release mouse button after leaving gui button the button will not raise OnLeftClick() event.
-Fix: OnCreate() is now propagated properly to base classes
-Codechange: old OnLeftClick() is now OnLeftButtonDown() (same with OnRightClick() and OnRightButtonDown()). New OnLeftClick() is now raised only by button when released.

(svn r8993) [cpp_gui] -Fix: ResizeBox now draws itself in lowered state when resizing

(svn r8992) [cpp_gui] -Add: CaptureTicket::IsActive() to determine if the ticket is in use

(svn r8991) [cpp_gui] -Codechange: composite widgets (incl. windows) now must implement CreateWidgets() method which is called from the default OnCreate() implementation

(svn r8986) [cpp_gui] -Add: resizing window by dragging ResizeBox
-Fix: Moving top-left corner of widget now moves is instead of resizing
-Add: Resizing widget/window now generates OnResize() event
-Add: Resizing container now generates OnResizeParent() for all children
-Add: Widget anchors (widgets now resize/move when container widget resizes)

(svn r8985) [cpp_gui] -Cleanup: copy/paste error (CaptionBar::OnCaptureMoving method name)