Make cimgui a module under a directory dependency

[geooot]

• Removes cimgui folder
• Creates deps/cimgui dependency which takes c source of cimgui and imgui and makes a static library out of it
• Ran translate-C on cimgui.h as a build step so that you don't need to inline it in the main.zig source
• Changed root build zig to use the new dependency

[floooh]

Thanks! Giving this a whirl now. I'll probably change the commit shas in build.zig.zon to more readable git tag names.

[floooh]

Btw, is ziphfile a typo or does that have a specific meaning? :)

sokol-zig-imgui-sample/deps/cimgui/build.zig

Line 43 in 66d5151

const ziphfile = cimgui_dep.path("cimgui.h");

[floooh]

Really loving the PR, thanks a lot :)

[geooot]

Btw, is ziphfile a typo or does that have a specific meaning? :)

sokol-zig-imgui-sample/deps/cimgui/build.zig

Line 43 in 66d5151

const ziphfile = cimgui_dep.path("cimgui.h");

@floooh Ah that was a copy paste error on my part. The variable represents the path to the header file. Probably "cimgui_h" is a better name.

[floooh]

Ok I'll change that. Otherwise everything merged and ready to go.