1.51
render: fix reference background disappearing in some cases (refraction + background env)
render: two sided option was sometimes ignored with refraction material
render: render png export has now antialiased alpha
render: fix render png export portrait mode not being consistent
interface: toolbox drag n drop was too sensitive (distance threshold is increased)
file: fix corrupted glb export (sometimes happening when a light was not visible)
file: fix STL export not working with dynamic topology meshes