🎥 Better `View` and `Camera` Support

[izzylys]

as discussed with @clairekuang & @JR-Morgan, views and cameras are due for a bit of a proper rethink as they are a bit too revit / rhino centric

the working solution is to

• simplify the View class into a single class in objects that can generally support apps like revit and rhino
• add an additional Camera class that inherits from view - this will add additional properties that are relevant to software like unreal, unity, and blender

additional note: several props will remain as computed properties to avoid confusion (making ppl think they are editable) which in the (hopefully near) future should also be computed on viewer side

related to specklesystems/speckle-blender#84