changelog
    
    
    - Sun, 17 Jun 2018 13:53:33 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 17 Jun 2018 13:53:33 +0300] rev 1403
 
    - replaced the Matrix class with QMatrix4x4
 
    - Sun, 10 Jun 2018 23:25:08 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 23:25:08 +0300] rev 1402
 
    - some rework in description
 
    - Sun, 10 Jun 2018 23:07:24 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 23:07:24 +0300] rev 1401
 
    - fixed bugs regarding circular primitives
 
    - Sun, 10 Jun 2018 21:48:58 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 21:48:58 +0300] rev 1400
 
    - refactored LDPolygon
 
    - Sun, 10 Jun 2018 17:17:42 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 17:17:42 +0300] rev 1399
 
    - added the disc and disc negative to the circular primitive type
 
    - Sun, 10 Jun 2018 16:50:14 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 16:50:14 +0300] rev 1398
 
    - changed LDCylinder to LDCircularPrimitive and moved circles to it
 
    - Sun, 10 Jun 2018 16:04:38 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 16:04:38 +0300] rev 1397
 
    - cleaned up LDColor constructors
 
    - Sun, 10 Jun 2018 15:53:21 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 15:53:21 +0300] rev 1396
 
    - show the color index in the color button
 
    - Sun, 10 Jun 2018 12:12:50 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 10 Jun 2018 12:12:50 +0300] rev 1395
 
    - separated the color button into a new widget
 
    - Fri, 08 Jun 2018 23:06:56 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Fri, 08 Jun 2018 23:06:56 +0300] rev 1394
 
    - fixed cylinder rendering