- Added the frozen_utils library to Python in order to expose the
modules and submodules that were frozen with Python.
- Using frozen_utils in order to find the modules that GDB usually
imports on init and importing them.
Using symlinks the submodules are added to appear just like any
downloaded unpacked tar.
Also added a Makefile clean rule to clean the submodules, which
includes Reseting the submodules to the origin branch state,
including ignored files.
