Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/oboe/samples/iolib/README.md

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+**iolib**
+==========
+Classes for playing audio data.
+
+## Abstract
+(Oboe) **iolib** contains classes implementing streaming audio playback and mixing from multiple sources. It's purpose is to demonstrate best practices and provide reusable code.
+
+ Note: the more general name of "iolib" was chosen  since it is presumed that this project will eventually implement audio capture capability.
+
+**iolib** is written in C++ and is intended to be called from Android native code. It is implemented as a static library.
+
+# **iolib** project structure
+* player
+Contains classes to support streaming playback from (potentially) multiple audio sources.
+
+## player classes
+### DataSource
+Declares the basic interface for audio data sources.
+
+### SampleSource
+Extends the `DataSource` interface for audio data coming from SampleBuffer objects.
+
+### OneShotSampleSource
+Extends `SampleSource` to provide data that plays through it's `SampleBuffer` and then provides silence, (i.e. a non-looping sample)
+
+### SampleBuffer
+Loads and holds (in memory) audio sample data and provides read-only access to that data.
+
+### SimpleMultiPlayer
+Implements an Oboe audio stream into which it mixes audio from some number of `SampleSource`s.
+
+This class demonstrates:
+* Creation and lifetime management of an Oboe audio stream (`ManagedStream`)
+* Logic for an Oboe `AudioStreamCallback` interface.
+* Logic for handling streaming restart on error (i.e. playback device changes)