Add UI for Markers with end seconds on scene player. #5633
+432
−74
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End seconds to markers was added in #5311. However, the UI has not yet had a way to show markers that are timespans instead of single timestamps. This PR adds support to show markers that are a timerange/timespan. To be able to see multiple markers that would have overlapping time ranges, time ranges stack when needed. Tags used for primary tags of markers are each assigned a unique/consistent (when possible) color so that users can easily distinguish the different markers. Also existing behavior with tag name on hover popping up is maintained.