change Xcode settings about indentation from space to tab #6900
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So, I didn't know oF code style, and it says use hard tab (4).
https://github.com/openframeworks/openFrameworks/wiki/oF-code-style
Because Xcode settings about indentation is space (4).
This PR change it (only oF library project, not include pg-template) to hard tab (4).