Allow developer to select which Logging filters are desired

[b1conrad]

Issue #536 did the desired filtering out of visual clutter.

This issue is about having a widget in the Logging tab where the developer could select desired filtering. Such as

1. no filtering -- everything shows
2. filter out UI queries (as is done in the code after #536)
3. show all queries only
4. show all events only
5. show only queries matching a RID prefix or pattern
6. show only events with a particular EID

and perhaps others. Note that the last two listed here would require a text field as well as a selection dropdown.