improve overall folder structure and update files according to structure

core/network/aria2_wrapper.py

@@ -0,0 +1,16 @@
+from .aria2_integration import run_aria2p
+
+def start_client():
+    global aria2
+    aria2 = run_aria2p()
+
+def add_magnet(uri):
+    aria2.add_magnet(uri)
+
+
+def terminate():
+    return
+
+
+
+