Revert "Use stb* directly"

This reverts commit 1b55c72.

Merge pull request #11 from UnGast/master

make stb_image stb_image_write stb_truetype definitions static

Fix maxOS version

Add S4TF interface, test

Add S4TF utils

Fix: area average resize can cause crash

Code format, add comment

Change FFT interface

Remove unnecessary files

Avoid enumerateLines for ubuntu