* rewrote http data reception/processing (instead of letting the net class split the data, do it in http_net directly; http data is stored as strings again now, instead of using the vector<char> approach from the net class); note that this still needs a configurable argument in the net class (irc is currently defunct because of that)
 * fixed chunked http data reception/processing (thanks to the previous change)
 * added a core::tokenize function that takes a string delimiter