Update binaries to holochain 0.0.42-alpha2

This release has no feature changes to Holoscape, it simply packages the v0.0.42-alpha2 holochain binary AND it points to the new sim2h server which is compatible with that release.

Important breaking change: any config files created with v0.0.5 or earlier will NOT work because they point to a sim2h server that is not compatible with v0.0.42-alpha2. You can manually update the sim2h server to: ws://public.sim2h.net in your conductor config file if you want to continue to use a given Holoscape config directory.