Ask if bitcoind should be installed

[MaxHillebrand]

Problem

Although Wasabi checks if there is bitcoind running locally, it would be nice if it also notifies the user that there is no local node, ask if he wants to link to a remote node, or if he want's to install one, or continue with SPV.
@Kixunil had that nice idea and we discussed it with @molnard.

Solutions

When first starting Wasabi...

• if there is a local node, automatically connect to it
• if there is no local node, throw a popup that there was no local node detected
  -- ask if the user has a remote node, and give an input field for the local IP [that is then added to the config file]
  -- ask if the user wants to install a node now and link to Bitcoin Core or something like @PierreRochard Node Launcher [Wasabi can continue running with BIP 158 in the meantime until IBD is finished]
  -- ask if the user want's to continue in SPV mode, but notify him of the risks

[Kixunil]

One way to resolve this issue would be to add Wasabi into Node Launcher and make Node Launcher the recommended way of installing Wasabi.

[davterra]

I would also like to see a popup confirming that it is indeed seeing and connecting to my requested node, be it local or remote.

[MaxHillebrand]

@davterra the network level privacy [clearnet // tor // own full node] will be shown in the bottom status bar with a specific color scheme.
But not sure when this will be finished, #twoweeks...

[davterra]

Excellent. Thanks Max

[MaxHillebrand]

Closing because of #2495 - that solution is even better: don't ask - make it the default!!