Support property nodes with colons in their key.

org_mode_samples/greater_element/property_drawer/key_with_colon.org

@@ -0,0 +1,6 @@
+* Overwrite
+  :PROPERTIES:
+  :header-args: :var foo="lorem"
+  :header-args:emacs-lisp: :var bar="ipsum"
+  :header-args:emacs-lisp+: :results silent :var baz=7
+  :END:

src/parser/property_drawer.rs

@@ -169,5 +169,8 @@ fn node_property_name_end<'b, 'g, 'r, 's>(
     _context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
-    alt((tag("+:"), tag(":")))(input)
+    recognize(tuple((
+        alt((tag("+:"), tag(":"))),
+        alt((space1, line_ending, eof)),
+    )))(input)
 }