WIP: added .editorconfig file, applied uncrustify to make indentation uniform

[seanm]

No description provided.

[hjmjohnson]

@seanm If we are going to diverge from the main nifti_c lib, I would propose making as many changes as necessary in one commit.

I prefer to use clang format. I have had better luck with integration into my editor workflows. Additionally, we could keep in sync with ITK and reduce the overall maintenance headaches.

[seanm]

I guess I thought at least making the indentation uniform would make it easier to work on the codebase, because currently it's a pain since touching different parts requires using different indentation, which my editor does not like.

I'd also like to use clang-format eventually.

I could give it another try, but even after using whatstyle clang-format was making many massive changes...