OpenSCAD

**Language Features**

* New
* Add function literals
* Add exponent function (e.g. 2^3)
* Add convexity parameter to resize()
* Add support for generic tail recursion
* Add $vpf for viewport field of view
* Add warnings for ranges with begin < end
* Add warnings for matrix structure problems

* Changed
* Allow random seeds to stick between rands() calls
* Make comparison operators on mixed types return undef
* Track reason for values turning undef

* Fixed
* Fix Range precision
* Fix empty geometry handling
* Fix search order for imported modules
* Improve internal handling of data values
* Improve performance of array concatenation
* Improve float accuracy of mirror matrix calculation
* Improve polygon and polyhedron warnings/errors

**Program Features**

* GUI
* Add jump to source code from 3D preview
* Add Error-Log window for tracking errors and warnings
* Add window menu to allow keyboard access to all docked windows
* Enable default binary stl output, and ascii option
* Show message in console when caches are flushed
* Disable HTML rendering in console
* Enable color scheme for CGAL 2D render