Update: immediate mode API improvements
- debug windows binary built from 2a311dfb
- ScopeRecorder automatically exports to json and cleans up recorder state
- added RecordScopeIfSlow(..., TimeSpan, ...) API, same as above except exports only if there was a delay
- updated unit tests since some scenarios are now impossible
Need to fix export next, wrap it with a couple server vars and update to release bins - then it's done
Tests: ran most of the unit tests (stress tests skipped as they would overflow with export tasks)