framework impl.: new file tree structure, take 3new
tree3fe96eda65ddfd4c65e6e7150d87e6735c7de0fe
drwxr-xr-x - etc
drwxr-xr-x - lib
-rw-r--r-- 1152 main.ly
drwxr-xr-x - scores
drwxr-xr-x - share
drwxr-xr-x - styles