Feature Request: Connect to self hosted Blockexplorer

[Smithiboss]

I have a self hosted blockexplorer on my own FullNode and it would be very useful and certainly in the interest of privacy if you could connect to your own blockexplorer. So if you open the transaction details and then click on the “Open in external block explorer” link at the bottom, there could then be the option to connect to your own block explorer, if previously set up.

[benma]

Related: #1207