Allow `Window/InteriorShading/Type` (and `ExteriorShading/Type` and `InsectScreen`)

[shorowit]

Choice values (e.g., "dark blinds") provided will be used to better default the summer/winter shading coefficients.

And do similar for exterior and insect screens:

• Interior shading
• Exterior shading
• Insect screens

[shorowit]

Proposed for HPXML schema:
hpxmlwg/hpxml#418