Complete redo of content indexing and querying (#517)

Complete redo of data store
Introduces live queries and live templates

common/markdown_parser/parse-query.terms.js

@@ -2,26 +2,31 @@
 export const
   Program = 1,
   Query = 2,
-  Name = 3,
+  TagIdentifier = 3,
   WhereClause = 4,
-  Where = 5,
-  LogicalExpr = 6,
-  FilterExpr = 7,
+  Identifier = 5,
+  Expression = 7,
   Value = 8,
   Number = 9,
   String = 10,
   Bool = 11,
-  Regex = 12,
-  Null = 13,
-  List = 14,
-  And = 15,
-  LimitClause = 16,
-  Limit = 17,
-  OrderClause = 18,
-  Order = 19,
-  OrderDirection = 20,
-  SelectClause = 21,
-  Select = 22,
-  RenderClause = 23,
-  Render = 24,
-  PageRef = 25
+  BooleanKW = 12,
+  Regex = 13,
+  List = 15,
+  LVal = 16,
+  Attribute = 17,
+  ParenthesizedExpression = 18,
+  LogicalExpression = 19,
+  BinExpression = 22,
+  InKW = 23,
+  Call = 24,
+  LimitClause = 25,
+  OrderClause = 27,
+  Order = 28,
+  OrderBy = 29,
+  OrderDirection = 30,
+  OrderKW = 31,
+  SelectClause = 32,
+  Select = 34,
+  RenderClause = 36,
+  PageRef = 38