[BUG #7273] Moved simple and indigo theme to mixin decorators only.
[BUG #7273] Changed decorators to not set positional styles.
[BUG #7273] Changed background decorators to apply the background color via style and not tint.
[BUG #7273] Use border-box sizing for decorators.
[BUG #7273] Removed shadow property from widget.
[BUG #7273] Removed protector div from widget.
[BUG #7273] Applied decorator styles to the content and removed the decorator element.
[BUG #7273] Adjusted layout (atom and abstract) to new decoration requirements.
[BUG #7273] The box-sizing property should be set by the widget and not the decorator in case a widget has no decorator.
[BUG #7273] Adjusted layouts to include padding
[BUG #7273] Removed some decorator element related unit tests.
[BUG #7273] MResizable does not require the decorator element anymore.
[BUG #7273] Adjusted layouts to include padding
[BUG #7273] Adjusted layouts to include padding for separators
[BUG #7273] Separators now use Widgets instead of decorator elements
[BUG #7273] Use box shadows to draw inner borders
[BUG #7273] adapted to modified renderLayout signature
[BUG #7273] don't apply undefined background color
[BUG #7273] Adjusted layout to include padding
[BUG #7273] Removed obsolete decorator classes