Fixes errors that appear when trying to run scripts using python3.
This also updates shebang to use Python3.

SandBlaster can now be imported to return the decompiled profile as a
dependency graph

Changes:
- Use absolute path for the logger config file
- Add get_graph_for_profile and process_profile_graph functions to
reverse_sandbox.py for returning the dependecy graph
- Add get_dependency_graph and get_paths functions to operation_node.py
that create the depenency graph.
- Decode strings as ASCII instead of bytes in sandbox_filter.py
- Remove a few unused variables