engine: Don't overwrite isTerminated if it's already true

initModule really not needed for uRandom

Fix engine crashes on game end - frontlib now waits until the engine actually disconnects - engine does not write round-end stats to stdout anymore on mobile (caused crash) - Removed HWTerminate function binding for android (not threadsafe, better send "eforcequit" over IPC for the same effect)

Burn a random number in the override. Make sure cirbuf is reset.