feat: duplicate send keys

1.3.0:

- feat: new duplicate send to layer feaure - `ctrl + shift + D` in GP dopesheet

__init__.py

@@ -15,7 +15,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Set of tools for Grease Pencil in animation production",
 "author": "Samuel Bernou",
-"version": (1, 2, 2),
+"version": (1, 3, 0),
 "blender": (2, 91, 0),
 "location": "sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",
@@ -46,6 +46,7 @@ from . import OP_render
 from . import OP_copy_paste
 from . import OP_realign
 from . import OP_depth_move
+from . import OP_key_duplicate_send
 from . import keymaps
 
 from .OP_pseudo_tint import GPT_OT_auto_tint_gp_layers
@@ -446,6 +447,7 @@ def register():
     OP_copy_paste.register()
     OP_realign.register()
     OP_depth_move.register()
+    OP_key_duplicate_send.register()
     UI_tools.register()
     keymaps.register()
     bpy.types.Scene.gptoolprops = bpy.props.PointerProperty(type = GP_PG_ToolsSettings)
@@ -467,6 +469,7 @@ def unregister():
     for cls in reversed(classes):
         bpy.utils.unregister_class(cls)
     UI_tools.unregister()
+    OP_key_duplicate_send.unregister()
     OP_depth_move.unregister()
     OP_realign.unregister()
     OP_copy_paste.unregister()