Remove the .js suffix from help texts of node invocations as well as
actual invocations as this is not necessary. Removing it opens up the
possibility of restructuring the code into a directory with the same
name.
Merge the masterIP and masterPort configuration entries into a single
masterURL entry. Fixes the problem with connecting to an HTTPS version
of the master server and also makes it easier to host the master server
behind a reverse proxy.
This breaks all known code interfacing Clusterio.