[ENHANCEMENT] Change AST nodes to be dataclasses

[ElBe-Plaq]

Change the AST module to use nodes of the following scheme:

@dataclass
class Node:
    name: str
    type: str # One of the possible types, sub classes such as VariableNode can use base types here
    value: Any
    below: Optional[List["Node"]] = None # Requires from __future__ import annotations
    arguments: Optional[List[str]] = None # Subject to of change, arguments or annotations for the node

Sub classes will inherit from them but use a custom __init__ method. The nodes of a program are stored in a list containing one item, the program node (contains args passed from the shell and the name of the file).

Todo:

• Change existing nodes
• Add more nodes
• Rewrite parser to use new AST system