Fixed missing dependency

Fixes issue preventing triangle meshes from showing, as well as some other minor fixes.

Note that the Windows MSI installer works fine, but after installation Windows doesn't seem to index the program. You have to find it yourself in the program files folder and create a shortcut somewhere.

You can instead download the Windows zip file, unzip that wherever you like, and run the app inside. Unfortunately I haven't been able to create a standalone app for Windows yet.