New Loading Structure v0.7

A New Structure to load the Library:

- one main init_Shaders.py file in script root
- Function Library and NodeLibrary have been moved into Subfolder
"Shaders"

- Register Files have been moved into Subfolder "NodeImport".

- Register Files inside Subfolder "NodeImport" get executed
automatically

- A new "CUSTOM_SHADER_PATH.PY" file has been put into the
/Scripts/Shaders/ Directory that gets sourced from all Nodes in the
Library.