Grammar: remove the dead CommandNode.hint_mode field

HintMode became per-node (Node::Hinted) in the node-attached refactor;
the per-command hint_mode field was never the mechanism and is now
read by nothing. Removed the field and its 20 `None` initialisers.

src/dsl/grammar/app.rs

@@ -192,87 +192,67 @@ pub static QUIT: CommandNode = CommandNode {
     shape: EMPTY_SEQ,
     ast_builder: build_quit,
     help_id: Some("app.quit"),
-    usage_ids: &["parse.usage.quit"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.quit"],};
 
 pub static HELP: CommandNode = CommandNode {
     entry: Word::keyword("help"),
     shape: EMPTY_SEQ,
     ast_builder: build_help,
     help_id: Some("app.help"),
-    usage_ids: &["parse.usage.help"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.help"],};
 
 pub static REBUILD: CommandNode = CommandNode {
     entry: Word::keyword("rebuild"),
     shape: EMPTY_SEQ,
     ast_builder: build_rebuild,
     help_id: Some("app.rebuild"),
-    usage_ids: &["parse.usage.rebuild"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.rebuild"],};
 
 pub static SAVE: CommandNode = CommandNode {
     entry: Word::keyword("save"),
     shape: SAVE_AS_OPT,
     ast_builder: build_save,
     help_id: Some("app.save"),
-    usage_ids: &["parse.usage.save"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.save"],};
 
 pub static NEW: CommandNode = CommandNode {
     entry: Word::keyword("new"),
     shape: EMPTY_SEQ,
     ast_builder: build_new,
     help_id: Some("app.new"),
-    usage_ids: &["parse.usage.new"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.new"],};
 
 pub static LOAD: CommandNode = CommandNode {
     entry: Word::keyword("load"),
     shape: EMPTY_SEQ,
     ast_builder: build_load,
     help_id: Some("app.load"),
-    usage_ids: &["parse.usage.load"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.load"],};
 
 pub static EXPORT: CommandNode = CommandNode {
     entry: Word::keyword("export"),
     shape: EXPORT_PATH_OPT,
     ast_builder: build_export,
     help_id: Some("app.export"),
-    usage_ids: &["parse.usage.export"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.export"],};
 
 pub static IMPORT: CommandNode = CommandNode {
     entry: Word::keyword("import"),
     shape: IMPORT_BODY_OPT,
     ast_builder: build_import,
     help_id: Some("app.import"),
-    usage_ids: &["parse.usage.import"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.import"],};
 
 pub static MODE: CommandNode = CommandNode {
     entry: Word::keyword("mode"),
     shape: MODE_VALUE,
     ast_builder: build_mode,
     help_id: Some("app.mode"),
-    usage_ids: &["parse.usage.mode"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.mode"],};
 
 pub static MESSAGES: CommandNode = CommandNode {
     entry: Word::keyword("messages"),
     shape: MESSAGES_VALUE_OPT,
     ast_builder: build_messages,
     help_id: Some("app.messages"),
-    usage_ids: &["parse.usage.messages"],
-    hint_mode: None,
-};
+    usage_ids: &["parse.usage.messages"],};