(cad/openscad) Updated 2015.03-3 to 2019.05 (Re: PR pkg/54302)

# OpenSCAD 2019.05

**Language Features:**

* New modules
    * assert() - stop script evaluation on failed constraints
    * let() - scoped assignment
* New functions
    * ord() - convert from character to Unicode code point
    * echo()
    * assert() - stop script evaluation on failed constraints
    * Type testing functions: is_undef(), is_list(), is_num(), is_bool(), is_string()
* New special variable: $preview variable which is set to true in preview mode
* List comprehension updates
   * Added if/else condition
   * Added each keyword
   * Added C-style for loop
   * Now allows looping over characters of a string
* rotate_extrude(): Added angle parameter to
* import() now supports SVG, 3MF and AMF
* color() now supports hex color codes
* Removed glide() and subdiv() which were never implemented

**Program Features:**

* Customizer: Allow parametrizing design parameters with GUI customization
* Support for using 3D-Mouse / Joystick / Gamepad input devices for controlling the 3D view
* 3D Printing support: Purchase from a print service partner or print to Octoprint
* New export file formats: SVG, 3MF, AMF
* Quick-edit and preview of values using Alt-Arrows (Shift-Alt-Arrows on macOS)
* Added --view cmd-line parameter
* Play sound notification on render complete
* Line numbers and filenames are now shown for many errors and warnings
* Hardwarning preference: Stop on first warning
* Hardwarning and assert now shows a stack trace
* New warnings
    * Module call parameterns don't match module declaration
    * Argument value of of range
    * Duplicate passed argument
    * Children passed to module not accepting children
    * Reference to inknown $special_variables
    * Duplicate assigment
* New translations: Ukrainian, Polish

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