Implement Evan Wallace's Rendering Technique

[prepare]

see=> Easy Scalable Text Rendering on the GPU (https://medium.com/@evanwallace/easy-scalable-text-rendering-on-the-gpu-c3f4d782c5ac)

BUT the original code (https://github.com/evanw/theta/blob/master/LICENSE.md) is GPL.

I can't look at the code => so I will implement it from his description.

[prepare]

LoopBlin see

1. https://www.microsoft.com/en-us/research/wp-content/uploads/2005/01/p1000-loop.pdf
   and
2. https://github.com/JoaoBaptMG/PathRenderingLab