tokeniser: refactor to store Module directly in Tokeniser

We hereby avoid making extra copies of the PathBuf.

- Also updated tests to match the new API

assembler/src/source/tokeniser/tests.rs

@@ -3,7 +3,7 @@
 use common::prelude::Register;
 
 use crate::{
-    context::AssemblerContext,
+    model::module::Module,
     source::{
         opcode::Opcode,
         token::{Token, TokenType},
@@ -11,20 +11,21 @@ use crate::{
         tokeniser::Tokeniser,
     },
 };
-use std::path::PathBuf;
+use std::{path::PathBuf, sync::Arc};
 
 /// Helper function to create a tokenizer from source text
 fn create_tokenizer_from_source(source: &str) -> Tokeniser {
-    let data = source.as_bytes().to_vec();
     let path = PathBuf::from("test.dsa");
-    Tokeniser::from_data(data, path)
+    let module = Module::new(path).expect("Cannot create module!");
+
+    Tokeniser::from_data(source.as_bytes().to_vec(), Arc::new(module))
 }
 
 /// Helper function to tokenize source and return tokens
 fn tokenize_source(source: &str) -> Result<Vec<Token>, crate::error::AssembleError> {
     let tokenizer = create_tokenizer_from_source(source);
-    let context = AssemblerContext::new();
-    tokenizer.tokenise(&context)
+
+    tokenizer.tokenise()
 }
 
 /// Helper function to extract token types from a token vector