Modify parsing functions and config structs to accept hcl changes

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/function/stdlib/doc.go

@@ -0,0 +1,13 @@
+// Package stdlib is a collection of cty functions that are expected to be
+// generally useful, and are thus factored out into this shared library in
+// the hope that cty-using applications will have consistent behavior when
+// using these functions.
+//
+// See the parent package "function" for more information on the purpose
+// and usage of cty functions.
+//
+// This package contains both Go functions, which provide convenient access
+// to call the functions from Go code, and the Function objects themselves.
+// The latter follow the naming scheme of appending "Func" to the end of
+// the function name.
+package stdlib