Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

website/Library/Core/Widget/Federated Template Copy.md

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+---
+description: >
+  Adds a convenient "Copy to my space" button to any
+  template found via federation
+tags: template
+hooks.bottom.where: 'name =~ /^!/ and tags="template"'
+---
+# Template actions
+* {[Page: Copy|Copy to my space]}: use this template in your space by making a local copy of it (and tweaking it as you like)

website/Library/Core/Widget/Linked Mentions.md

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+---
+description: Adds Linked Mentions to pages
+tags: template
+hooks.bottom.where: 'true'
+---
+```template
+# We need to escape handlebars directives here, since we're embedding
+# this template into a template (INCEPTION)
+template: |
+  {{escape "#if ."}}
+  # Linked Mentions
+  {{escape "#each ."}}
+  * [[{{escape "ref"}}]]: `{{escape "snippet"}}`
+  {{escape "/each"}}
+  {{escape "/if"}}
+query: |
+  link where toPage = "{{@page.name}}" and page != "{{@page.name}}"
+```

website/Library/Core/Widget/Linked Tasks.md

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+---
+tags: template
+description: |
+  Shows all tasks that contain a link the current page. For instance a task that references `[[John]]` in its name, would appear on the `John` page.
+---
+
+```query
+task where name =~ /\[\[{{escapeRegexp @page.name}}\]\]/ where done = false render [[Library/Core/Query/Task]]
+```

website/Library/Core/Widget/Table of Contents.md

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+---
+description: Adds a Table of Contents to pages
+tags: template
+hooks.top:
+  where: 'true'
+  # Show all the way at the top
+  order: 0
+---
+```toc
+minHeaders: 3
+```

website/Library/Core/Widget/Tagged Tasks.md

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+---
+tags: template
+description: Queries all tasks tagged with a specific tag.
+usage: Pass in the tag to filter on as the `value` of this template
+---
+
+```query
+task where tags = "{{.}}" and done = false render [[Library/Core/Query/Task]] 
+```