feat: port Hatena server to Python 3

* Update server-side database and dynamic resource code for Python 3
* Preserve existing Flipnote, UGO, NTFT, CSS, localization, and Hatena assets
* Port Flipnote upload and movie endpoints
* Update front page UGO menu generators
* Preserve existing database and sample Flipnote data
* Add regression tests for database operations and binary formats
* Add server resource loading tests
* Maintain compatibility with the original DSi Flipnote Studio protocol

hatenadir/ds/v2-xx/post/flipnote.post.py

@@ -0,0 +1,25 @@
+from twisted.web import resource
+
+from hatena import ServerLog, Silent, request_args, client_ip
+from DB import Database
+
+
+class PyResource(resource.Resource):
+    isLeaf = True
+
+    def render_GET(self, request):
+        ServerLog.write("%s got 403 when requesting post/flipnote.post with GET" % client_ip(request), Silent)
+        request.setResponseCode(405)
+        return b"405 - Method Not Allowed"
+
+    def render_POST(self, request):
+        data = request.content.read()
+        channel = request_args(request).get("channel", [""])[0]
+        add = Database.AddFlipnote(data, channel)
+        if add:
+            ServerLog.write('%s successfully uploaded "%s.ppm"' % (client_ip(request), add[1]), Silent)
+            request.setResponseCode(200)
+        else:
+            ServerLog.write("%s tried to upload a flipnote, but failed..." % client_ip(request), Silent)
+            request.setResponseCode(500)
+        return b""