feat: double-click handlers for items

[v-ein]

---

name: Pull Request
about: Create a pull request to help us improve
title: Allow double_click_handler to be bound to items
assignees: @hoffstadt

---

Closes #1534

Description:
Added a double-click handler for items, modeled after the regular click handler, but with appropriate click flags being pulled from ImGui.

Concerning Areas:
None.

[Pcothren]

Verified working on windows by replacing demo.py

DearPyGui/dearpygui/demo.py

Lines 2647 to 2651 in 334a216

	with dpg.item_handler_registry(tag="demoitemregistry"):
	dpg.add_item_clicked_handler(0, callback=lambda s, a, u: print(f"clicked_handler: {s} '\t' {a} '\t' {u}"))
	dpg.add_item_clicked_handler(1, callback=lambda s, a, u: print(f"clicked_handler: {s} '\t' {a} '\t' {u}"))
	dpg.add_item_hover_handler(callback=lambda s, a, u: print(f"hover_handler: {s} '\t' {a} '\t' {u}"))
	dpg.bind_item_handler_registry(cb, "demoitemregistry")

with

                with dpg.item_handler_registry(tag="demoitemregistry"):
                    dpg.add_item_clicked_handler(0, callback=lambda s, a, u: print(f"clicked_handler: {s} '\t' {a} '\t' {u}"))
                    dpg.add_item_clicked_handler(1, callback=lambda s, a, u: print(f"clicked_handler: {s} '\t' {a} '\t' {u}"))
                    dpg.add_item_hover_handler(callback=lambda s, a, u: print(f"hover_handler: {s} '\t' {a} '\t' {u}"))
                    dpg.add_item_double_clicked_handler(callback=lambda s, a, u: print(f"double_clicked_handler: {s} '\t' {a} '\t' {u}"))

Thanks for the fix!