LDPartEditor 0.8.7-beta

Changes:
With the release of 0.8.7 you are able to...

• ...benefit from a faster program start.
• ...toggle the visibility of conditional line control points.
• ...drag&drop files on the 3D editor view.
• ...drag&drop files on the text editor view.
• ...use the new "modern" GUI layout on a fresh installation.
• ...activate anti-aliasing on some linux systems with MESA/Gallium. (on Windows, for AMD/NVIDIA cards, you have to enable it manually, with AMD Catalyst or the NVIDIA Control Panel)

The following critical issues are fixed:

1. Risk of data loss: When you open a file again (which was unsaved in LDPE) the file in the 3D view gets cleared.
2. "Show selection in text editor" did not work correctly for subfiles, if the text editor was closed before.
3. "Open Part File" from the 3D editor opens a text editor window, too.
4. Identical lines are not detected if they have different colours.
5. CSG does not work with invalid colour numbers.
6. "Unselect" (Ctrl+Click) does not work for subfiles.
7. Subfile selection issues with adjacent subfiles.
8. The coarse/medium/fine grid buttons don't stay pushed.