Release 0.5.1

• Updated code to match lltl library headers.
• Better integration with system::follow_url() routine.
• Added automatic style creation from XML schema.
• Added simple language configuration support by the tk::Schema class.
• Fixed allocation for invisible widgets inside the tk::Grid container.
• Updated behaviour of TextDataSink to be more memory-effective.
• Property 'size_constraints' renamed to 'constraints' for tk::Align and tk::Group widgets.
• Added 'set_horizontal' and 'set_vertical' methods to the embedding property.
• Fixed crash on empty tk::Grid container, added constraints() property to the tk::Grid widget.
• Added parse() method to all enumeration properties.
• Fixed knob behaviour which didn't trigger SLOT_CHANGE event when dragging knob's scale.
• Added ipadding() property for internal padding of the tk::Group widget.
• Fixed bugs reladed to SLOT_CHANGE notification delivery for tk::Switch widget.
• Added drawing mode for the widget that allows to switch between different kinds of widget look.
• Added basic background color inheritance support to widgets.
• Rendering of graph widget has been fixed and enhanced with "border.flat" property.
• Replaced text_border property for tk::Group widget with text_padding property.
• Added heading property for tk::Group widget.
• Replaced text_border property for tk::ComboGroup widget with text_padding property.
• Added heading property for tk::ComboGroup widget.
• Fixed missing builtin styles for tk::ComboGroup widget.
• Added spin_spacing property to tk::ComboGroup widget.
• Added 'balance_color', 'balance_color_custom', 'flat' and 'scale_marks' properties to the tk::Knob widget.
• Added font scaling feature to the tk::Font property.
• Added freetype2 library dependencies for UNIX-compatible operating systems.
• Added possibility to specify custom fonts in the stylesheet data.
• Added font loading support by the tk::Schema object.
• Fixed bug in menu item allocation that could yield to ugly-looking menus.
• Implemented proper UI schema loading at the runtime.
• Added tk::Registry class for managing widgets.
• Denied copy constructor usage for all widget classes.
• Added tk::Bevel widget which allows to draw bevels/facets in the UI.
• Added tk::Arrangement property which allows to arrange some element inside of another.
• Indicator now supports modern-style drawing.
• Added tk::MultiLabel widget for drawing vector glyphs.
• Added tk::TextAdjust property and support of this property by several widgets.
• Added support of hovers by the tk::Label widget.
• Fixed bug with UIE_MOUSE_IN and UIE_MOUSE_OUT event delivery when entering/leaving window.
• tk::Button now allows to use different colors for different states.
• Removed obsolete tk::StyleInitializer class.
• Fixed memory corruption in tk::Grid widget related to invalid cell pointers after reallocation of memory chunk.
• Additional feature added to ComboGroup that allows to select the active visible widget.
• Updated build system.

Release 0.5.0

• Initial release