Allow View Styles on Exe or Web Standalone

Currently, the newer stylised view styles (sketch, watercolour) are not supported by the Exe/Web Standlone export. The watercolour style in particular is helpful for client demonstrations that are early concepts without full materiality - the coloured surfaces are easier for clients to understand than just the white/polystrol views, but the presentation style is more diagramattic and cartoon-like, so as to not reveal too much of a finalised design.

Enabling standalone viewers to use these styles would provide more flexible ways to present models to clients without having to demonstrate on a machine running enscape.