ERC-Gates v4.1 for Eco 9.6.x

Due to human (non-bot) spam the first contribution of a user has to be reviewed and activated manually, all further contributions do not require this.
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Modern Gates from Corrugated Steel

Version 1 - add Fence Gate

Version 2 - add Wall Gate

Version 3 - add Left and Right models

Version 4 - add Recipe, and bug fixed

Version 4.1 - Support Eco 9.6.x