Sweet Home 3D full changelog

Added information about Java and Java 3D providers in About dialog box.
Added com.eteks.sweethome3d.singleInstance system property which makes each launch of Sweet Home 3D run in a separated process when set to false.
Fixed toggling magnetism when Alt key is released under Windows.
Fixed a drawing bug of solid polyline joints.
Adjusted the image scale of items of the plan copied to the clipboard to prevent out of memory errors.
Accepted DAE files with empty mesh sources.
Fixed a bug which removed the color or texture of a wall adjacent to a modified room.
Fixed the top view in the plan of the mirrored furniture rotated around its Y axis.
Used lower case for texture names exported to OBJ format to avoid possible conflicts on case insensitive systems.
Fixed the deletion of folders in work directory when they contain subfolders.
Ensured the message about version updates is displayed in front of preferences dialog under macOS.

Fixed a bug which prevented from modifying a piece of a furniture group in Virtual visit mode, after adding that piece to a group in Aerial view mode.
Fixed the totals update after a price change of a piece belonging to a furniture group.
Fixed a bug which prevented from changing a textured material to white color.
Fixed horizontal and vertical alignment mouse behavior on room and furniture names when Shift is pressed.

Managed the selection toggling of an item in the furniture list without losing the selection of other items in the plan.
Optimized the cache management of the furniture top views in the plan for similar furniture.
Fixed the location of the top view of a piece of furniture in its selection rectangle at large zoom factors.
Used more precise text widths to correctly align multi line texts.