1.2.1-Alpha.6 Updated File Handler

Re-released on 4/28 to make sure the right version is in BrewFlasher.

Mostly this is to get the new filesystem handler out there. Access it via /fs/.

What's Changed

• Filelist by @lbussy in #175

Full Changelog: 1.2.1-Alpha.5...1.2.1-Alpha.6