Append the appropriate file extension to the file name if the file name
does not have a file extension. This is a know issue with the GTK+ file
dialog.
Make the last 3D viewer screenshot last file used code more coherent.
Add the 3D viewer main frame trace string to the trace environment
variables doxygen group.
Doxygen comment and other minor code cleaning.
Fixes lp:1804980
https://bugs.launchpad.net/bugs/1804980
* Refresh the view only when changes are made in the caller frame.
* Allows recreate a new instances when try to open the 3D view from a frame taht is not the initial caller
* Remove duplicate code in kicad frames.
* Split and rewrite the preview window and canvas.
* Create a new class for handling the board information.
* Adds new render targets: openGL, legacy, and ray tracing.
* Render targets take full advantage of the new 3D plugins system and 3D cache
for a fast 3D model loading.
* Faster board loading.
* New OpenGL render is faster than the old one.
* New ray tracing render target with a post processing shader.
* Use of new 3D plugins (WRL, X3D, STEP and IGES) and 3D model caching.
* Preview of 3D model while browsing the file name.
* 3D preview of the footprint while adding / align 3D shapes.
* Render of 3D models according to attributes: Normal, Normal+Insert, Virtual.
* Pivot rotation centered in one point over the PCB board.
* Shortcuts keys improved for XYZ orientation..
* Animated camera.
Wayne Stambaugh
jean-pierre charras
Carsten Schoenert
Jeff Young
Marvin Schmidt
Simon Richter
Chris Pavlina
Mrio Luzeiro