Bump Kobo firmware version for release of 3.12.0

Bumping firmware version in preparation for release of 3.12.0 with an
allowance for 3.12.1. Fixes #1398794 [Kobo firmware version bumped to 3.12.0](https://bugs.launchpad.net/calibre/+bug/1398794)
Driver for the new CYBOOK MUSE ebook reader

Fixes #1398672 [[Enhancement] device support for Cybook Muse](https://bugs.launchpad.net/calibre/+bug/1398672)
Forgot the list of supported format for the MUSE driver
Edit book/Book polishing: Fix subsetting of fonts whose @font-face rules use the local() or format() CSS functions not working
Merge branch 'master' of https://github.com/cbhaley/calibre
...
Use the new "other device connected" API to tell the wireless device which other device is blocking connections.