Don't count FKs & PKs as numbers + robustly handle `:default` token

Add datetime interval arithmetics

* Setting MB_JETTY_HOST in test runner (not sure this achieves anything TBH)

* Disable draggable action buttons on cards when editing dashboard

* Card filter parameter mappings should not be draggable either (5365, 7068)

* Filter mapping Prettier

* changes "null" to "nil" for embedded ruby example

* moves :exp out of the :params

* lint cleanup

* Support nested queries with 2+ of the same aggregation; improve metadata

clean up add-settings & tests

* Changing the anchor link back to Line + Bar chart

* Adding a closing tag

[ci skip]

* include field_refs in QP results :cols
* Remove u/drop-first-arg; rewirte Card filter functions as multimethod

[ci drivers]

* Include name of joined table in field display_name
[ci drivers]

* Fix linter errors

* Display metric name instead of underlying aggregation name in QP results
[ci drivers]
Resolves #1851

* Test fixes 

* Update troubleshooting bugs.md

* Update per Victoria's suggestion

* Removed ServerLogs.png image and simplified console links per Maz's suggestions

* [segments] fix edit segments; don't use diff for definition changes

* [segments] don't use diff at all on segment updates

* [metrics] don't use diff at all on metric updates either

* [segments] use original body fields + norm'd def

* [test] wip update metric/segment tests

[ci skip]

[ci skip]