MycroftOS: Implementation of a very first initial bootable version

- Add Buildroot patches to downgrade / upgrade package dependencies
  in line with the Mycroft A.I. software stack requirements.
- Add buildroot additional package dependencies in line with the
  Mycroft A.I. software stack requirements.
- Update rpi3 defconfig file.
- Implement initial root_fs overlay filestructure.
- Addition of some quick and dirty helper scripts.
- Update of README to reflect these changes.

buildroot-external/package/python-pulsectl/Config.in

@@ -0,0 +1,8 @@
+config BR2_PACKAGE_PYTHON_PULSECTL
+	bool "python-pulsectl"
+	select BR2_PACKAGE_PYTHON_SETUPTOOLS # runtime
+	help
+	  Python high-level interface and ctypes-based bindings for
+	  PulseAudio (libpulse).
+
+	  http://github.com/mk-fg/python-pulse-control

buildroot-external/package/python-pulsectl/python-pulsectl.hash

@@ -0,0 +1,6 @@
+# md5, sha256 from https://pypi.org/pypi/pulsectl/json
+sha256	b18741b8ccd34244bc132601e0ed8fd2bd68289f52d8e415c14f3606893949b1  pulsectl-17.7.4.tar.gz
+md5	eb2ebb4825b350210b14221d83c69551  pulsectl-18.8.0.tar.gz
+sha256	119d419c66b373a69628219641a6cf14d5dc3c33be82f6b38198db5633d14353  pulsectl-18.8.0.tar.gz
+# Locally computed sha256 checksums
+sha256	6844c3ddfa1f805abfb31e904b53dfc0bb8ba28bf8719e7617a783c188a1a02b  COPYING

buildroot-external/package/python-pulsectl/python-pulsectl.mk

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-pulsectl
+#
+################################################################################
+
+PYTHON_PULSECTL_VERSION = 17.7.4
+PYTHON_PULSECTL_SOURCE = pulsectl-$(PYTHON_PULSECTL_VERSION).tar.gz
+PYTHON_PULSECTL_SITE = https://files.pythonhosted.org/packages/ed/14/4734e40340ab115e53762617c8fa654255e1b6e0d72c129e47f78a02429f
+PYTHON_PULSECTL_SETUP_TYPE = setuptools
+PYTHON_PULSECTL_LICENSE = MIT
+PYTHON_PULSECTL_LICENSE_FILES = COPYING
+
+$(eval $(python-package))