move flatten and flattener into helpers

pokemontools/crystal.py

@@ -6785,21 +6785,6 @@ def to_asm(some_object, use_asm_rules=False):
     asm += "\n; " + hex(last_address)
     return asm
 
-def flattener(x):
-    "flattens a list of sublists into just one list (generator)"
-    try:
-        it = iter(x)
-    except TypeError:
-        yield x
-    else:
-        for i in it:
-            for j in flattener(i):
-                yield j
-
-def flatten(x):
-    "flattens a list of sublists into just one list"
-    return list(flattener(x))
-
 def get_dependencies_for(some_object, recompute=False, global_dependencies=set()):
     """
     calculates which labels need to be satisfied for an object

pokemontools/helpers.py

@@ -12,3 +12,18 @@ def grouper(some_list, count=2):
     given: [1, 2, 3, 4]
     returns: [[1, 2], [3, 4]]"""
     return [some_list[i:i+count] for i in range(0, len(some_list), count)]
+
+def flattener(x):
+    "flattens a list of sublists into just one list (generator)"
+    try:
+        it = iter(x)
+    except TypeError:
+        yield x
+    else:
+        for i in it:
+            for j in flattener(i):
+                yield j
+
+def flatten(x):
+    "flattens a list of sublists into just one list"
+    return list(flattener(x))