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Fix UnitmotionFlying and implement CMessageMotionUpdate::FromJSVal

Description

Fix UnitmotionFlying and implement CMessageMotionUpdate::FromJSVal
In rP22526 have been changed message from MotionChanged to MotionUpdate and CMessageMotionUpdate::FromJSVal was not implemented to reflect changes in message structure.
As a result UnitMotionFlying tries to send MotionChanged message which not only was renamed, but sending it from js is not supported anymore.
Also reported at this thread: https://wildfiregames.com/forum/index.php?/topic/27294-cheats-error/

Differential Revision: https://code.wildfiregames.com/D2450
Tested by: @gameboy
Tested on: Jenkins/vs2015, Jenkins/gcc6
Fixes: #5626