[NEW] dynamic_main: New dynamic main/argv helper!

See t/dynamic_main.bash for an early example of how to use it.

t/dynamic_main.bash

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+fns=( hello )
+
+hello() {
+	[ "$1" == help ] && echo -n "Say \"hello.\"" && return 0
+	echo hello.
+}
+
+. "$(dirname "$0")/../dynamic_main.bash"