Power Toys 17.3.0: Icon Colors

Repo: Jumoo/umbraco.community.powertoys

New Icon Colors power toy: add custom colours to the v17 icon picker, or swap back to the 19 Umbraco 13 icon colours so icons picked in v13 get their own colour again (works around umbraco/Umbraco-CMS#22543)
Released v17.3.0 to NuGet
Docs: screenshots for the Icon Colors page, and a new dashboard screenshot on the homepage showing all 11 power toys