[WIP]:Switch to the network specified in the URL preferentially

[sxlwar]

If the URL includes network information, e.g: https://apps.darwinia.network/#network=crab，user should stay in crab network

[sxlwar]

Both these forms are allowed

• http://localhost:3000/?rpc=wss://substrate-rpc.parity.io/#/explorer
• http://localhost:3000/#/explorer?rpc=wss://substrate-rpc.parity.io

Inside apps, we always format it as the first form.