Value mappings does not work for text based simple macros

Simple macros ({host:key.func()}) use evaluate_LAST() to resolve last(), prev() functions. Now evaluate_LAST() automatically quotes/escapes text values which breaks the value mapping.

We could unquote text values before value mapping lookup, that would be a quick fix. Proper fix probably might be to change evaluate_LAST() to return unquoted value and then quote when inserting it into expressions (that depends if item type is available at that level, but most probably it is).