Consider providing a way to download DApp bundling multiple networks

[filippsen]

Summary

Currently, the downloaded DApp takes a single and specific network into account when exporting (using the Download DApp button in the Preview window). Considering multiple deployments have been made on a previous step, the idea would be to export all the available deployments and configurations as a "prepared bundle", containing information for all networks, all in the same standalone package.

Motivation

suppose, I've a dapp deployed on both testnet & mainnet, ETC, ETH clone/ privatechain. If I've all network id, Tx hash and address from diff networks so users are free to switch between networks on Dapp, or fallback to network provided by metamask/ other providers.