Track watch activity for scenes. (#3055)

* track watchtime and view time
* add view count sorting, added continue position filter
* display metrics in file info
* add toggle for tracking activity
* save activity every 10 seconds
* reset resume when video is nearly complete
* start from beginning when playing scene in queue

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

pkg/models/value.go

@@ -199,6 +199,18 @@ func NewOptionalFloat64(v float64) OptionalFloat64 {
 	return OptionalFloat64{v, false, true}
 }
 
+// NewOptionalFloat64 returns a new OptionalFloat64 with the given value.
+func NewOptionalFloat64Ptr(v *float64) OptionalFloat64 {
+	if v == nil {
+		return OptionalFloat64{
+			Null: true,
+			Set:  true,
+		}
+	}
+
+	return OptionalFloat64{*v, false, true}
+}
+
 // OptionalDate represents an optional date argument that may be null. See OptionalString.
 type OptionalDate struct {
 	Value Date