added recommend github files

Minimal repository content to describe this project and define files to hide from git.
added git attributes
changed Yutils to be a submodule

As submodule, actual versions are referenced, no need to store an old copy.
moved existing files into fitting directories
removed script "border" spaces

Bad style, harder to read for most other programmers & slower parsing.
extended text.to_shape to accept all valid scales

ASS shape mode to scale: 2^(MODE-1) <-> Scale to ASS shape mode: log2(SCALE)+1