Minor fixes

• Tweaked the module mode by centralizing the "find" logic.
• Replaced exec() logic with the importlib logic again to preserve line numbers in subsequent files.
• Created a Script class that takes care of some of the import/execution logic, it takes content and not filenames.
• Fixed a bunch of issues in examples/guided.py that caused issues, namely #61 where lists were given where strings were supposed to be etc.