v0.0.104.0

v0.0.104.0

 * Updates to LDK version 0.0.104. See
   https://github.com/lightningdevkit/rust-lightning/releases/tag/v0.0.104
   for the full changelog.
 * Use `Reference.reachabilityFence` to work around Java's somewhat
   poorly documented memory model. This seems to be the intended use so
   its likely this will fix the early finalization bugs we've seen, but
   formal documentation on the Java memory model appears to be lacking
   so its possible (albeit unlikely) that more may be required later.
   This bumps our required Java version from 1.8 to 9.
 * Exposes `Hash` and `Eq` via Java's `hashCode` and `equals`.
 * Thows an exception instead of incorrect operation if multiple
   `ChannelMonitor`s for the same channel are provided to a
   `ChannelManagerConstructor`.
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