Show original C error messages

[Omustardo]

For crashes, it would be great if it showed the original error message rather than the original line number. So instead of:

File: /home/runner/work/cimgui-go/cimgui-go/cimgui/imgui/imgui.cpp, Line: 9932
exit status 1

pointing to https://github.com/gabstv/cimgui-go/blob/main/cimgui/imgui/imgui.cpp#L9932

It would instead give the error: Mismatched Begin/BeginChild vs End/EndChild calls: did you forget to call End/EndChild?
or even the full line: IM_ASSERT_USER_ERROR(g.CurrentWindowStack.Size == 1, "Mismatched Begin/BeginChild vs End/EndChild calls: did you forget to call End/EndChild?");

I'm not familiar with cgo so I'm not sure how feasible it is, but it would definitely save a lot of time when debugging.

[Omustardo]

I got this working, though it's a bit hacky: https://gist.github.com/Omustardo/ba21538445cbc9ff89ad43a4366f7382

$ ebiden_debug.sh go run .
Hello World!
File: /home/runner/work/cimgui-go/cimgui-go/cimgui/imgui/imgui_widgets.cpp, Line: 7597
exit status 1
Line 7597 from imgui_widgets.cpp:
    IM_ASSERT(window->Flags & ImGuiWindowFlags_Popup);  // Mismatched BeginMenu()/EndMenu() calls

The script works by extracting the line number from the error message and then retrieving the line from that file on github. Like: https://raw.githubusercontent.com/gabstv/cimgui-go/main/cimgui/imgui/imgui_widgets.cpp

This would be better if it used the local versions of those files, but I'm not quite sure where they are. Somewhere in GOPATH I'm sure.