feat: add (expr) in plan for non-matched generic text.

Also allow other characters in day names (#16)

Author: emiasims

corpus/basic.tst

@@ -2140,7 +2140,7 @@ Plan.8b - Junk
         (expr)))))
 
 ================================================================================
-Plan.9  - Expression
+Plan.9  - TsExpression
 ================================================================================
 * a
 <%%(b)> [%%c]
@@ -2291,3 +2291,22 @@ Plan.14a - Successful
         (entry_name)
         (timestamp
           (date))))))
+
+================================================================================
+Plan.15  - Expr
+================================================================================
+* a
+<1-1-1 *123>
+--------------------------------------------------------------------------------
+
+(document
+  (section
+    (headline
+      (stars)
+      (item
+        (expr)))
+    (plan
+      (entry
+        (timestamp
+          (date)
+          (expr))))))

grammar.js

@@ -161,11 +161,12 @@ org_grammar = {
     date: $ => /\p{N}{1,4}-\p{N}{1,4}-\p{N}{1,4}/,
 
     _ts_element: $ => choice(
-      alias(/\p{L}+/, $.day),
+      alias(/\p{L}[^\]>\p{Z}\n\r]*/, $.day),
       alias(/\p{N}?\p{N}[:.]\p{N}\p{N}( ?\p{L}{1,2})?/, $.time),
       alias(/\p{N}?\p{N}[:.]\p{N}\p{N}( ?\p{L}{1,2})?-\p{N}?\p{N}[:.]\p{N}\p{N}( ?\p{L}{1,2})?/, $.duration),
       alias(/[.+]?\+\p{N}+\p{L}/, $.repeat),
       alias(/--?\p{N}+\p{L}/, $.delay),
+      alias(prec(-1, /[^\]>\p{Z}\n\r]+/), $.expr),
     ),
 
     paragraph: $ => seq(optional($._directive_list), $._multiline_text),

src/grammar.json

@@ -786,7 +786,7 @@
           "type": "ALIAS",
           "content": {
             "type": "PATTERN",
-            "value": "\\p{L}+"
+            "value": "\\p{L}[^\\]>\\p{Z}\\n\\r]*"
           },
           "named": true,
           "value": "day"
@@ -826,6 +826,19 @@
           },
           "named": true,
           "value": "delay"
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "PREC",
+            "value": -1,
+            "content": {
+              "type": "PATTERN",
+              "value": "[^\\]>\\p{Z}\\n\\r]+"
+            }
+          },
+          "named": true,
+          "value": "expr"
         }
       ]
     },

src/node-types.json

@@ -795,6 +795,10 @@
           "type": "duration",
           "named": true
         },
+        {
+          "type": "expr",
+          "named": true
+        },
         {
           "type": "repeat",
           "named": true