Before this change, `app.booting` was set by Application plugin as part
of regular phase invocation, which executes individual plugins in
subsequent turns of the event loop. As a result, `app.booting` was
initially `undefined` despite the fact that the booting process was
already in progress.
This patch moves manipulation of `app.booting` flag directly to
`Bootstrapper#run` method, to ensure it's set early enough and always
properly cleared at the end.
- refactor logic of processing artifacts into their own classes
- introduce Container as the main class for bootstrapping and build a
registry of handlers during boot to organize them by a hierarchy
denoted by path
- adopt middleware like registration and invocation
- container.use(path, handler)
- container.run(context, done)
- allow more phases during boot
- boot is now asynchronous
Nora
Agnes Lin
Miroslav Bajtoš
Walker
jannyHou
Jürg Lehni
Raymond Feng
Supasate Choochaisri