Item command: perform search when item not matched

Perform a "contains" search on all in-context items (and groups) if one is not precisely matched:

• Still return full item / group list if no name given
• Keep requirement of an exact name match before performing a non-read operation - do not attempt to guess the match, even if only one comes back
• Normalize capitalization prior to search - see #39 for possible follow-up / expansion