Update imgui to 1.82-docking

[tolstenko]

• I've followed this guide
  step by step carefully. [Yes]

Yes, but I had one issue. I couldn't send a merge request from my branch from my repo to a branch that does not exist in the origin. The imgui's branch 'docking' does not exist in the https://github.com/hunter-packages/imgui and I don't have access to properly create the branch docking to map the branch docking from imgui. So I couldn't create the merge request to a branch that doesn't exist in the hunter-packages/imgui .

I did a fork at https://github.com/InfiniBrains/imgui and put my changes there, I created the branch properly etc...

Pls guide me in the better way to address this issue, so the imgui would be updated properly.

[rbsheth]

Hi @tolstenko, thanks for your contribution! Typically we create a new fork in https://github.com/cpp-pm and then update the branch accordingly. https://github.com/hunter-packages is deprecated and will not be updated.

I made a Hunter branch for you here: https://github.com/cpp-pm/imgui/tree/hunter-docking-085cff2

First, make a PR with your Hunterization changes to that branch. Once approved and merged, we can cut a release and you can use that release here in this PR.