Support GetForegroundDrawList

[kaishuu0123]

Motivation

• I am making an emulator with golang and imgui-go in my project.
• In the process, I wanted to use imgui to draw text on the Foreground.

Question

• Do I need to update inkyblackness/imgui-go-examples ?
  • From CONTRIBUTION.md

Reference of ocornut/imgui

• link to GetForegroundDrawList functions
  • https://github.com/ocornut/imgui/blob/master/imgui.cpp#L3813-L3822
• refs commit
  • Renamed GetOverlayDrawList() to GetForegroundDrawList() for consistency. Kept redirection function (will obsolete)
  • ocornut/imgui@94e794f

Screenshot & Example code

imgui.ForegroundDrawList().
		AddText(
			imgui.Vec2{X: 10, Y: 10},
			imgui.PackedColor(0xFFFFFFFF),
			"Hi, this text is \ndrawn by GetForegroundDrawList",
		)

P.S.

Thank you for publishing this wonderful repository.
imgui-go is a simple and very easy to use project.

[dertseha]

Thank you for your contribution!
I would be very grateful if you could showcase this as well by expanding the Go demo window. This, in case it has an equivalent place like in the original ImGui demo window. However, this being a very specific function, I suspect this may be a lot of work in order to mimic the original. So it is OK if that's a little too big of a task compared to the extension.

[kaishuu0123]

Thanks for the merge!

I would be very grateful if you could showcase this as well by expanding the Go demo window. This, in case it has an equivalent place like in the original ImGui demo window. However, this being a very specific function, I suspect this may be a lot of work in order to mimic the original. So it is OK if that's a little too big of a task compared to the extension.

If I can make time to write a demo, I will give it a try.