checking in some WIP

* added some netx funcs
* added netx/dnsx
* currently updating docs and adding *x funcs to sprigx

stringsx/func_asciiinvaliderror.go

@@ -0,0 +1,18 @@
+package stringsx
+
+import (
+	`fmt`
+)
+
+// Error conforms an [AsciiInvalidError] to an error interface.
+func (a *AsciiInvalidError) Error() (errStr string) {
+
+	errStr = fmt.Sprintf(
+		"non-ASCII character '%c' at line:linepos %d:%d (byte %d), "+
+			"string position %d (byte %d): bytes %#x, UTF-8 codepoint U+%04X",
+		a.BadChar, a.Line, a.LineChar, a.LineByte,
+		a.Char, a.Byte, a.BadBytes, a.BadChar,
+	)
+
+	return
+}