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2536768a43
Introduction of system themes. System themes are local themes which: - Cannot be deleted; - Cannot have “custom code” added, components only; - Cannot have uploads; - Cannot edit color palettes; - Are updated on deploy, like core plugins. This PR added the Foundation system theme, which is an empty theme like Default. The Foundation theme will be added in the next PR. In a development environment, when system theme files are changed/added/deleted, the theme is reuploaded and the page is reloaded to make it a good experience for the engineer working on improvements. System themes are not visible until `SiteSetting.experimental_system_theme` is enabled.