Add .wrl support

[Toctave]

As the title says, this PR adds basic WRL support. I've done only the bare minimum, so there aren't any import options for instance. That being said, in the long run it would perhaps be better to somehow inherit the import UI from each import format rather than recreating it in the add-on.

[neverhood311]

What's the difference between WRL and X3D? Why did you remove all mentions of X3D? (I'm most familiar with OBJ, PLY, and STL, so I don't know much about X3D)

[Toctave]

I don't really know the difference actually (not an X3D expert either, I just wrote this change for a coworker who needed to visualize .wrl sequences).

Blender has the same importer for both file extensions, hence why I initially mentioned "X3D/WRL" everywhere, but due to how your add-on currently scans for files I needed to have a single file extension, hence I figured I'd go with .wrl everywhere first and then maybe add .x3d back in.

I'll give the X3D/WRL thing a quick look and let you know.

[neverhood311]

Blender has the same importer for both file extensions, hence why I initially mentioned "X3D/WRL" everywhere, but due to how your add-on currently scans for files I needed to have a single file extension, hence I figured I'd go with .wrl everywhere first and then maybe add .x3d back in.

Interesting. That's a good catch

Also, I've already added this feature (x3d at least) to v2.2.0. See #144. You might want to start your branch from there instead of from master.

[Toctave]

Oh, ok, thanks! How come the branch with the most recent changes is not the default one ?