Upon my own decision, the two tox_encryped_new convenience functions were removed due to basically needing two different sets of error codes.
At iphydf's suggestion the corresponding tox_get_encrypted_savedata convenience functions were removed as well.
Also, all data now has the magic number prepended. This is incompatible
for all but the save/load functions, but I think nothing besides the one
experimental qTox branch used any of those, which is why I feel confident
about the change.
