scripts: Add scripts for converting WRL to X3D
3d_models: Batch add X3D files converted from VRML
scripts: mods_to_pretty: Add X3D conversion

Modify ".wrl" paths to be ".x3d" paths and also ensure all "WRL" models
have been converted to "X3D"
modules: Mass update .pretty 3D model paths

Point to the X3D model instead of the VRML model.