works between linux and Android clients. Required renaming so struct
names and names of fields within match in c and java code. The point
is to test this as the foundation of rematch: now you have to type in
a deviceID in order to invite, which clearly sucks for users. Either
that goes away, or it's replaced with something that scans existing
games and lists past opponents as possible invitees.
the case where one of several guests wants to rematch is a hard
problem for later.) Requires passing old-style relayIDs (connname plus
device index) when devIDs aren't available, which they may not always
be.
for Rematch): works for linux version, provided you know the relayID
of the device you're inviting. Added to common/ a stream-saving
version of java's NetLaunchInfo I'll probably want to use there too
for cross-platform compatibility (there being no jni support for
json.)
