Major changes in 1.17.0
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* daemon: Ensure monitors are not prematurely finalized
* daemon: Fix crash when cancelling channel operations
* daemon: Tweak read sizes
* daemon: Close channels belonging to the active mount only
* daemon: Add infrastructure for the backends to exit cleanly
* channel: Unqueue cancelled requests
* channel: Verify that replies are for the right serial
* channel: Fix readahead behaviour
* channel: Return proper error if we're out of free fds
* mtp: Refactor read path in preparation for supporting normal files
* mtp: Use Android extensions to support in place read and write of files
* mtp: Use normal filenames in paths
* mtp: When removing cache entries, remove children too
* mtp: Clear previous cache entries when refreshing a directory
* mtp: Clear cache and emit delete events when an object is removed
* mtp: Handle overwriting of files in do_push and do_pull correctly
* mtp: Use standard name for SD Card icon