Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

website/Library/Core.md

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+This library is highly recommended for everybody to import immediately. It provides a lot of functionality you’ll likely appreciate (and may be used to having out of the box, if you’re longer-term SilverBullet user).
+
+Some random examples:
+* [[Table of Contents]] and [[Linked Mentions]]
+* All the slash commands you know and love, ranging from `/h1` to `/task` to `/table` to `/code` to `/query` to `/template` to `/today` to...
+* Some useful general purpose pages such as [[Library/Core/Page/Maintenance]] and [[Library/Core/Page/Template Index]].
+
+# Installation
+To import this library, run the {[Library: Import]} command in your SilverBullet space and enter:
+
+    !silverbullet.md/Library/Core/
+
+# Included templates
+```query
+template
+where name =~ /^{{escapeRegexp @page.name}}\//
+render [[Library/Core/Query/Template]]
+```
+
+# Included utility pages
+```query
+page
+where name =~ /^{{escapeRegexp @page.name}}\// and tags != "template"
+render [[Library/Core/Query/Page]]
+```