update to v1.80

[yadmtr]

cimgui now supports v1.80 (with tables), please update CImGui if possible.

And could you return to the docking support question, please.

[Gnimuc]

Sorry, I'm currently reworking Clang.jl and don't have much time on this.

[sefffal]

If I were to submit a PR to update CImGui_jll to the latest version, would that help? Or is the main challenge in updating the Julia bindings?

[Gnimuc]

updating the Julia bindings, since Clang.jl cannot handle forward decls correctly, we cannot regenerate those bindings by one click, that's exactly why I'm reworking Clang.jl.

[sairus7]

Is there some workaround to show tables in 1.79 before 1.80 is added?