GNOME dependable installation, structure and style improvements

Split utils in utils.py to a directory
Moved ./gnome-shell_css/ to ./gnome-shell/.css/

scripts/utils/__init__.py

@@ -0,0 +1,10 @@
+from .concatenate_files import concatenate_files
+from .copy_files import copy_files
+from .destinaiton_return import destination_return
+from .generate_file import generate_file
+from .hex_to_rgba import hex_to_rgba
+from .label_files import label_files
+from .remove_files import remove_files
+from .remove_keywords import remove_keywords
+from .remove_properties import remove_properties
+from .replace_keywords import replace_keywords