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
1) Change the wireless device driver to manage its own connections.
2) Add an API for devices to determine if some other device is connected.
Merge branch 'master' of https://github.com/cbhaley/calibre
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