v0.9.4 with some big performance improvements

Sorry for all the updates lately, but new functionality always causes shaking out of other things. 0.9.4 finally fixed a long-running gripe of mine, where the actual encode took forever to start up, especially when handling large .wav files over the network.

There’s also a bunch of cleanup to the progress indicator, which hopefully will make it more obvious what’s actually going on under the hood.