Improve Android lib API
9f749061 Improve Android lib API:
- rename OnionmasqHelper to Onionmasq (main lib API), rename former Onionmasq to OnionmasqJni, which should only be used internally now.
- Reduce necessary arguments and calls to initialize/start/stop onionmasq.
build on top of !49 (merged), which needs to be merged before this one can be reviewed