HS1177 mount for ZMR250 (no top plate)

Update: ~20° version added. Untested at this time.
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Update: Added a version that mounts to two of the arm screws instead of the two front screws. Should therefore work with the top plate as well if needed. This moves the camera further back for better protection.
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Based on the mount STL by derelicte on RC groups and the linked source..
Allows you to mount the HS1177 a little backwards, using the front mounting holes of the frame if you are not usin