cad/sweethome3d: update Sweet Home 3D to version 7.5
- Mitigate long-standing "Surface not cachable" error by running with -Dsun.java2d.opengl=true (alternative setting -Dsun.java2d.xrender=false should also work)
- Drop -Xmx1024m from Java options, it made sense when default MaxHeapSize value was half the available RAM with a minimum of 16 MB and a maximum of 512 MB, but had been changed around 2020 to 25% physical memory up to 25 GB, so this adjustment is no longer needed
- Prepare YafaRay renderer for modern CMake while here
JDK issue: https://bugs.openjdk.org/browse/JDK-8201631
PR: 274849
Reported by: portscout