TODO list.

[IN PROGRESS] Add what is left to do to the TODO list.

Networking:
    [NEEDS TESTING] UPnP port forwarding. (https://github.com/irungentoo/toxcore/pull/969)
    [NOT STARTED] NAT-PMP port forwarding.

DHT:
    [ALMOST DONE] Metadata collection prevention. (docs/Prevent_Tracking.txt)
    [IN PROGRESS] Hardening against attacks.
    [IN PROGRESS] Optimizing the code.

[DONE] Friend only group chats
    [DONE] Networking base.
    [MOSTLY DONE] Syncing chat state between clients (nicknames, list of who is in chat, etc...)
    [NOT STARTED] Private messages. (and adding friends from group chats using those private messages.)
    [NOT STARTED] File transfers.

[IN PROGRESS] Audio/Video
    [DONE] encoding/streaming/decoding
    [DONE] Call initiation
    [DONE] Encryption
    [IN PROGRESS] Auditing.
    [NEEDS TESTING] Video packet splitting.
    [IN PROGRESS] Prevent audio skew (seems to be easily solvable client side.)
    [IN PROGRESS] Group chats, audio done.

Friend_requests.c:
    [NOT STARTED] What happens when a friend request is received needs to be changed.
    [NOT STARTED] Add multiple nospam functionality.

[DONE] File transfers
[NOT STARTED] Offline messaging
[IN PROGRESS] Friends list syncing
[DONE] IPV6 support

[IN PROGRESS] Make toxcore thread safe.

[NOT STARTED] Make the core save/datafile portable across client versions/different processor architectures.

[MOSTLY DONE] A way for people to connect to people on Tox if they are behind a bad NAT that 
blocks UDP (or is just unpunchable) (docs/TCP_Network.txt) (Current way doesn't scale very well.)

[DONE] Encrypted Saves. (see: toxencryptsave)


[NOT STARTED] Security audit from professionals