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-cachetools/Config.in

@@ -0,0 +1,6 @@
+config BR2_PACKAGE_PYTHON_CACHETOOLS
+	bool "python-cachetools"
+	help
+	  Extensible memoizing collections and decorators.
+
+	  https://github.com/tkem/cachetools

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

@@ -0,0 +1,5 @@
+# md5, sha256 from https://pypi.org/pypi/cachetools/json
+md5	aced22583c2ce8672f73e570e5430bd7  cachetools-2.1.0.tar.gz
+sha256	90f1d559512fc073483fe573ef5ceb39bf6ad3d39edc98dc55178a2b2b176fa3  cachetools-2.1.0.tar.gz
+# Locally computed sha256 checksums
+sha256	67aece1bc071b753da8a24bcf8953b0e7cd873780aeddce5990864822fdb734b  LICENSE

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

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-cachetools
+#
+################################################################################
+
+PYTHON_CACHETOOLS_VERSION = 2.1.0
+PYTHON_CACHETOOLS_SOURCE = cachetools-$(PYTHON_CACHETOOLS_VERSION).tar.gz
+PYTHON_CACHETOOLS_SITE = https://files.pythonhosted.org/packages/87/41/b3e00059f3c34b57a653d2120d213715abb4327b36fee22e59c1da977d25
+PYTHON_CACHETOOLS_SETUP_TYPE = setuptools
+PYTHON_CACHETOOLS_LICENSE = MIT
+PYTHON_CACHETOOLS_LICENSE_FILES = LICENSE
+
+$(eval $(python-package))