Nintendo Switch Support / Samsung Emergency Fix

Samsung users should upgrade to v4.2, this release fixes freezes after an upload attempt. This is very serious regression since 3.9, so it deserves the new release.

Nintendo Switch is very important addition in this release too. Its features are pretty much limited, because Nintendo implemented the absolute minimum command set. Also it is lacking any write functionality, but still surprisingly functional (it even has thumbnails!).
Fuse FS implementation now can operate without partial read extension, using in-memory object cache.

Another important features are is multiple device support. aft-mtp-cli now has -d <filter> option allowing you to filter matching devices. The same applies to aft-mtp-mount (-D <filter>). UI will show simple dialog with list. Kill functionality moved into that dialog too.

More missing MacOSX bits implemented (EP stall flag clear).
Travis CI build log: https://travis-ci.org/whoozle/android-file-transfer-linux/builds/752033786/