Parse version manifest and download forge libraries.

TODO:
Integrate base url propagation.
Integrate PackXZExtract to calculate hashes  of jar.pack.xz files.
OR ammend the distribution spec to accept different hash algos (requires helioslauncher update).

.vscode/tasks.json

@@ -9,7 +9,10 @@
             "tsconfig": "tsconfig.json",
             "problemMatcher": [
                 "$tsc"
-            ]
+            ],
+            "presentation": {
+                "reveal": "silent"
+            }
         }
     ]
 }