feat: Major grammar improvements and refactoring

- Refactor statement parsing with proper precedence handling
- Improve block structure parsing with indent/dedent support
- Enhance control flow parsing (conditionals, loops)
- Add print command support
- Improve function declaration parsing
- Update scanner for better string and comment handling
- Add comprehensive test corpus
- Better handling of newlines and statement boundaries

corpus/stonescript.txt

@@ -145,9 +145,9 @@ equipL poison wand
 equipR vigor shield *7 +5
 ------------------
 (source_file
-  (command (identifier))
   (command (identifier) (identifier))
-  (command (identifier) (identifier) (identifier) (number) (number))
+  (command (identifier) (identifier) (identifier))
+  (command (identifier) (identifier) (identifier) (star_level (number)) (enchantment_level (number)))
 )
 
 ==================
@@ -158,9 +158,9 @@ activate R
 loadout 1
 ------------------
 (source_file
-  (command (identifier))
-  (command (identifier))
-  (command (number))
+  (command (identifier) (identifier))
+  (command (identifier) (identifier))
+  (command (identifier) (number))
 )
 
 ==================
@@ -299,17 +299,17 @@ Real Example from Manual
 (source_file
   (conditional
     (binary_expression (identifier) (identifier))
-    (block (command (identifier)))
+    (block (command (identifier) (identifier)))
   )
   (conditional
     (binary_expression (identifier) (identifier))
     (block
-      (command (number))
+      (command (identifier) (number))
       (conditional
         (binary_expression (identifier) (identifier))
         (block
-          (command (identifier))
-          (command (identifier) (identifier) (number))
+          (command (identifier) (identifier))
+          (command (identifier) (identifier) (star_level (number)))
         )
       )
     )
@@ -317,21 +317,21 @@ Real Example from Manual
   (conditional
     (binary_expression (identifier) (identifier))
     (block
-      (command (identifier) (identifier))
-      (command (identifier) (identifier))
+      (command (identifier) (identifier) (identifier))
+      (command (identifier) (identifier) (identifier))
       (conditional
         (binary_expression
           (member_expression (identifier) (identifier))
           (number)
         )
         (block
-          (command (identifier) (identifier) (identifier) (number))
+          (command (identifier) (identifier) (identifier) (enchantment_level (number)))
         )
       )
     )
   )
   (conditional
     (binary_expression (identifier) (number))
-    (block (command (identifier)))
+    (block (command (identifier) (identifier)))
   )
 )