Freezes ST3 when editing large TSV files

[invizibility]

i can edit just fine when the plugin is disabled.

[adzenith]

Yeah, it takes forever when the files are large. I tried to do some profiling using python's profile library, but it didn't reveal any obvious bottlenecks. I'm not sure what takes so long on large files.

[eugenesvk]

FYI I've added a PR #19 that might offer some relief — the freezing happens only after some delay after the last edit, so at least it's not happening while you're actively typing.
The async API alternative mentioned in that PR would be the proper solution, but it bugs a bit