Import/export options for Sweet Home 3D files #174
Description
Until Pascal Editor, the almost only FOSS was Sweet Home 3D, which is build on Java, have a web version and is available on Win/Mac/Linux (even a Flatpak is available). It is very complete and powerful, but the UI is a lit clunky and dated.
Following related issues (158, 145) would be great to have the possibility to import/export directly a .sh3d file.
SH3D are essentially ZIP archives that store 2D and 3D views of house plans, including furniture models, textures, lighting information, and camera positions. The internal structure of an SH3D file includes a Home.xml (afterward was used the Home, a Java Object Serialization), ContentDigests (SHA-1 hashes for images and models) and last some numbered files and directories for JPEG, MTL, and OBJ files.