- don't do subprocess in SafeHTMLParser, it doesn't work in frozen mode
and an attempt to fix it would take too much refactoring and I'm not
even sure it would work
- instead, make it handle broken unicode correctly
- I think the previous reports of freezes were caused by trying to
interpret data as unicode, causing a crash
- it does about 1MB/s on my machine, so a timeout is not a big problem
- saveKnownNodes replaced the repeated pickle.dump
- with knownNodesLock instead of acquire/release
- outgoingSynSender had an unnecessary loop during shutdown causing
excessive CPU usage / GUI freezing
- rearranged code to reduce cyclic dependencies
- doCleanShutdown is separated in shutdown.py
- shared queues are separated in queues.py
- some default values were moved to defaults.py
- knownnodes partially moved to knownnodes.py
