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/remove_properties.py

@@ -0,0 +1,20 @@
+def remove_properties(file, *args):
+    """
+    Remove properties from a file
+    :param file: file name
+    :param args: properties to remove
+    """
+
+    new_content = ""
+
+    with open(file, "r") as read_file:
+        content = read_file.read()
+
+        for line in content.splitlines():
+            if not any(prop in line for prop in args):
+                new_content += line + "\n"
+            elif "}" in line:
+                new_content += "}\n"
+
+    with open(file, "w") as write_file:
+        write_file.write(new_content)