Added SRI estimation methods

[tg359]

Issues addressed by this PR

Closes #257

Added methods to estimate SRI from a colour, or estimate thermal and solar emittance from an SRI (useful for creating building materials from target SRIs). Also made dataset references a bit easier to manage by defining these at module level.

Test files

See the included pytest files in this PR. The following may be run as an alternative:

from ladybugtools_toolkit.honeybee_extension.sri import estimate_sri_from_color, estimate_sri_properties

print(estimate_sri_from_color(color_hex="#a1b2c3", thermal_emittance=0.76))
print(estimate_sri_properties(target_sri=75.5, target_emittance=0.9))

Changelog

Additional comments

[Tom-Kingstone]

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[bhombot-ci]

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