DolphinWX: Kill off trivial event tables

Also fixes some of the wonky stuff in Main where we would fire an event to do post-init stuff which isn't necessary anymore.
Merge pull request #1518 from lioncash/evt

DolphinWX: Kill off trivial event tables
Update Externals/SFML to 2.1

- all files converted to unix line endings
- files from other subsystems and most of system have been removed
- include/SFML/System.hpp and include/SFML/Network.hpp  modified to
  not include removed stuff
Port dolphin to SFML 2.1