Stop using unsafeWindow

Greasemonkey 2.0 doesn't support unsafeWindow anymore, for security reasons.
The workaround is putting all our code inside a script tag and running it
in the constext of the main page (just as a bookmarklet would) instead of
running it in the Greasemonkey context.

Fixes #157
Pass sender's username to message filters and rewriters.
Added Pokémon Stadium bank bot filter.
Uppercase only first word in setting comments.
Replaced "Pokemon Stadium" with just "Stadium" in setting comments to prevent text wrapping.
Merge pull request #158 from hugomg/unsafewindow

Stop using unsafeWindow. Fixes #157.
Merge pull request #159 from MattiasBuelens/stadium-bankbot

Added Stadium bank bot filter.