Added 'Evaluation Time' setting access to Path Animation panel.

This was previously only available from the datablocks viewer, but this is the direct replacement to the badly named 'speed' ipo-curve in the past ('speed' implies a rate that must be integrated/added to the results of past frame, rather than a factor).

Also, tweaked the RNA definition so that this shows as a slider (i.e. a factor), since the valid values for this are clamped to the [0, 1].

release/scripts/ui/properties_data_curve.py

@@ -180,11 +180,9 @@ class DATA_PT_pathanim(DataButtonsPanelCurve):
 
         layout.active = curve.use_path
 
-        row = layout.row()
+        col = layout.column()
         layout.prop(curve, "path_length", text="Frames")
-
-        if wide_ui:
-            row.label()
+        layout.prop(curve, "eval_time")
 
         split = layout.split()