* copy pasted the missing funcs & tests from github.com/hashicorp/terraform/lang/funcs/  39e609
* forced github.com/bmatcuk/doublestar to use v1.1.5 so that TestFileSet passes; v1.2 had a different behavior.
* renamed terraform's ReverseFunc to ReverseListFunc

as they are non deterministic

…llFunc

*  so that the decision on wether to use a regular expression falls upon the caller and not a heuristic
* and the caller can decide the number of times replace is done

Quoting our discussion: zclconf#37 (comment)

This one doesn't feel like a good fit for cty stdlib because it makes some assumptions about how we deal with the filesystem that are unlikely to be a good fit for all callers. If this were to be in cty we'd want to think about ways to let the calling application have more control over how filenames are resolved so that e.g. it could be safe to use the filesystem-related functions in an app with different security concerns, but that would likely make it a lot more complicated. So this will be done in another PR.

* they would be a lot to maintain or are not canonical functions