modularize src

+ merge main.py and manage.py
+ move start logic to swingmusic/__main__.py
+ add a run.py on the project root

swingmusic/utils/network.py

@@ -0,0 +1,31 @@
+import socket as Socket
+
+
+def has_connection(host="google.it", port=80, timeout=3):
+    """
+    # REVIEW Was:
+    Host: 8.8.8.8 (google-public-dns-a.google.com)
+    OpenPort: 53/tcp
+    Service: domain (DNS/TCP)
+    """
+    try:
+        Socket.setdefaulttimeout(timeout)
+        Socket.socket(Socket.AF_INET, Socket.SOCK_STREAM).connect((host, port))
+        return True
+    except Socket.error as ex:
+        return False
+
+
+def get_ip():
+    """
+    Returns the IP address of this device.
+    """
+    soc = Socket.socket(Socket.AF_INET, Socket.SOCK_DGRAM)
+    try:
+        soc.connect(("8.8.8.8", 80))
+    except OSError:
+        return None
+    ip_address = str(soc.getsockname()[0])
+    soc.close()
+
+    return ip_address