Add 'zimgui/' from commit 'a053e62c779b1ba303e21330b266a1b32d26b27a'

git-subtree-dir: zimgui
git-subtree-mainline: b0d2e231b0
git-subtree-split: a053e62c77

zimgui/zig-cimgui-tasks.md

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+- Export `IMGUI_PATH` environment variable to downloaded package.
+- cd `generator` directory
+- `luajit generator.lua 'zig cc' 'comments internal noimstrv' glfw vulkan`
+- compile cimgui/cimgui.cpp, imgui/*.cpp, imgui/backends/*.cpp all together
+- install cimgui/cimgui.h, imgui/*.h, cimgui/generator/output/cimgui_impl.h
+
+Zig needs to access cimgui.h and cimgui_impl.h
+
+Set a custom loader. Instructions in imgui_impl_vulkan.h
+
+- cdefine `IMGUI_IMPL_VULKAN_NO_PROTOTYPES`
+- call `ImGui_ImplVulkan_LoadFunctions` before `ImGui_ImplVulkan_Init`
+
+not quite sure yet what the role of `ImGui_ImplVulkanH_Window.UseDynamicRendering` is
+