ignore_case + regex support in have.value & co

[yashaka]

Consider adding regex support to the following conditions:

• have.value
• have.value_containing
• have.attribute(name).* (all *)
• have.no.* versions of same conditions

Take #529 as example of implementation and also the corresponding ignore case implementation...

[yashaka]

ignore_case was implemented for value-like attribute conditions in one of commits for #530 on applying _EntityHasSomethingSupportingIgnoreCase and _CollectionHasSomeThingsSupportingIgnoreCase... Something similar can be implemented in context of ...SupportingRegexPatterns