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Description:
A rephrase of the work in #2011: trying to fix #2106 in a more deterministic and thorough way. Introduces 2 fundamental changes:
Forced sequential launch of emulators (i.e. await launch if a launch is in session).
Implemented by including the emulator spawn in the lock-file scoped handler function (i.e. don't unlock until emu starts loading).
Post-launch delay (todo)
Avoid moving forward to ADB commands until all emulators have completed spawning.
This addresses the now well-know adb-jam problem (see #1857), which - following #2011, I suspect reproduces when an emulator launches while an adb command is in-flight. In a way, this half-baked change sets out to test that theory.