Candera Engine 2D

Checks on set Bounding and Layout Rectangle

New methods Node2D::IsBoundingRectangleSet and Node2D::IsLayoutingRectangleSet have been introduced. BoundingBox calculation of groups and layout of DefaultLayouter now also consider set bounding boxes on groups.

New feature flag to disable 2D Layout

A new CMake feature flag CANDERA_2D_LAYOUTING_ENABLED (default ON) has been introduced, which allows to remove the whole code for dynamic layout.