deploymentvelocity attributes to <flightdata> element. The motor
digesting algorithm was changed. Adds <separationevent> and
<separationdelay> elements to stage components (except sustainer).
+
+1.5: Introduced with OpenRocket 12.xx. Added ComponentPresets.
+ Added lowerstageseparation as recovery device deployment event.
+
+1.6 (pre):
+ Added <datatypes> section for supporting datatypes other than
+ internal ones. Currently only supports datatypes from custom expressions.
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