* Simplified UI and flow between apps, the editor, and visiting an individual app.
* App management by long-pressing an app icon (set default, publish, view history, ...).
* Lots of behind the scenes plumbing for future app workflow improvements.
* Fixed reloading of missing images.
* Added a protocol app containing relevant bits of the SSB protocol guide.
* Update: CodeMirror, libuv 1.52.0, zlib 1.3.2.
