Make parse_options work with everything: cmd line, config files, values with spaces, op val, op=val, etc.

t/lib/samples/bash/config001.conf

@@ -1,5 +1,5 @@
---string-opt=abc
---typeless-option
+string-opt=abc
+typeless-option
 --
 --host=127.1
 --user=daniel

t/lib/samples/bash/config002.conf

@@ -1 +1,5 @@
---string-opt "hello world"
+# Line comment.
+string-opt=hello world
+
+   
+int-opt = 100   # Inline comment.