v5.0.0

=====================================================================

Excited to bring V5 to life. This includes some BREAKING CHANGES to
several aspects of ZSH-type scwrypts. Please refer to the readme
for upgrade details (specifically docs/upgrade/v4-to-v5.md)

--- New Features -------------------------

- ZSH testing library with basic mock capabilities

- new scwrypts environment file format includes metadata and more
  advanced features like optional parent env overrides, selection
  inheritence, and improved structurual flexibility

- speedup cache for non-CI runs of ZSH-type scwrypts

- ${scwryptsmodule} syntax now allows a consistent unique-naming
  scheme for functions in ZSH-type scwrypts while providing better
  insight into origin of API calls in other modules

- reusable, case-statement-driven argument parsers in ZSH-type scwrypts

--- Changes ------------------------------

- several utility function renames in ZSH-type scwrypts to improve
  consistency

- documentation comments included in ZSH libraries

- ZSH-type scwrypts now allow library modules to live alongside
  executables
  (zsh/lib still supported; autodetection determines default)

--- Bug Fixes ----------------------------

- hardened environment checking for REQUIRED_ENV variables; this removes
  the ability to overwrite variables in local function contexts

plugins/kube/set-namespace

@@ -0,0 +1,41 @@
+#!/usr/bin/env zsh
+use kubectl --group kube
+#####################################################################
+
+MAIN() {
+	local USAGE="
+	usage: [namespace] [...options...]
+
+	args:
+	  namespace   (optional) the full name of the namespace context to set
+
+	options:
+	  --subsession   kube.redis subsession (default 0)
+
+	  -h, --help   show this dialogue and exit
+	"
+	local NAMESPACE
+	local SUBSESSION=0
+
+	while [[ $# -gt 0 ]]
+	do
+		case $1 in
+			--subsession ) SUBSESSION=$2; shift 1 ;;
+
+			-h | --help ) utils.io.usage; return 0 ;;
+
+			* )
+				[ $NAMESPACE ] && echo.error "unexpected argument '$2'"
+				NAMESPACE=$1
+				;;
+		esac
+		shift 1
+	done
+
+	[ $NAMESPACE ] || NAMESPACE=$(kube.kubectl.namespace.select)
+	[ $NAMESPACE ] || echo.error 'must provide or select a valid namespace'
+
+	utils.check-errors --fail
+
+	kube.kubectl.namespace.set $NAMESPACE
+}