Bulk-page class remove + bulk conditional adding classes

1. Define a class 2. Strip that class from every on-page component that has it So the overall process could be: 1. Define a class and another class. The second class will be added to all components on the current page/template with the first class. 2. Define a class, and it will be purged from all components on the current page/template. requested via Oxy discord https://discord.com/channels/728310564543266879/728310565058904076/922487984153067540