Python: replace '%' with str.format for examples & templates

Use modern/preferred string formatting for user facing scripts.

scripts/templates_py/gizmo_custom_geometry.py

@@ -108,7 +108,7 @@ class MyCustomShapeWidget(Gizmo):
             delta /= 10.0
         value = self.init_value - delta
         self.target_set_value("offset", value)
-        context.area.header_text_set("My Gizmo: %.4f" % value)
+        context.area.header_text_set("My Gizmo: {:.4f}".format(value))
         return {'RUNNING_MODAL'}
 
 

scripts/templates_py/operator_file_export.py

@@ -4,7 +4,7 @@ import bpy
 def write_some_data(context, filepath, use_some_setting):
     print("running write_some_data...")
     f = open(filepath, 'w', encoding='utf-8')
-    f.write("Hello World %s" % use_some_setting)
+    f.write("Hello World {:s}".format(use_some_setting))
     f.close()
 
     return {'FINISHED'}

scripts/templates_py/operator_modal_view3d.py

@@ -26,7 +26,7 @@ class ViewOperator(bpy.types.Operator):
         if event.type == 'MOUSEMOVE':
             self.offset = (self._initial_mouse - Vector((event.mouse_x, event.mouse_y, 0.0))) * 0.02
             self.execute(context)
-            context.area.header_text_set("Offset %.4f %.4f %.4f" % tuple(self.offset))
+            context.area.header_text_set("Offset {:.4f} {:.4f} {:.4f}".format(*self.offset))
 
         elif event.type == 'LEFTMOUSE':
             context.area.header_text_set(None)

scripts/templates_py/ui_previews_dynamic_enum.py

@@ -39,7 +39,7 @@ def enum_previews_from_directory_items(self, context):
     if directory == pcoll.my_previews_dir:
         return pcoll.my_previews
 
-    print("Scanning directory: %s" % directory)
+    print("Scanning directory:", directory)
 
     if directory and os.path.exists(directory):
         # Scan the directory for `*.png` files