Version 1.0.0

In this release, we update dependencies, switch the license back to the GNU General Public License v3 because it's actually not allowed to downgrade to Apache 2 (whoops), update project metadata, add mttkinter dependency because it fixes a thread safety issue with tktrio, move a bunch of the code from __init__ into two separate modules, extension and utils, where utils is a general module for building extensions and extension is specific to this project, which makes it much easier for me to have bugfixes from my other extensions be able to transfer to this one, add license headers to all the files, handle a very strange case where a Trio run fails to exit properly, and fix a bug where the extension can crash when there are no file comments.

Full Changelog: v0.2.7...v1.0.0