A GResource file extractor made in python.
GResource is a precompiled bundle file that stores the source files
of a GTK theme. You can learn more about it by running man gresource.
There is a program, gresource, that provides some operations to
these files. The more important of them are: list and extract.
It works by calling the command gresource list <target_file> to
get a list of the resources within the GResource file, and then,
calling gresource extract <res_name> for every resource within
the GResource file, capturing its output and writing it to a file.