Support for configuring multiple Zandronum/QZandronum engines for join command

[RoyDefined]

Is your feature request related to a problem? Please describe. Currently it is only possible to configure a single Zandronum/QZandronum server location. This might make the join command invalid as the server uses a different engine version than what is configured.

Describe the solution you'd like It should be possible to list multiple engines of the same type, rather than a single one. The configuration screen should provide the option to add one or more engine locations.

Each instance of the list should then have three values:

• If the engine is a Zandronum or QZandronum engine
• The engine version. This should be a dropdown of available versions, either fetched online or hardcoded.
• The location of the engine on the user's device.

The join command should then determine the engine that the server requires based on what version the server returns in their first response packet.

Describe alternatives you've considered N/A

Additional context N/A

[RoyDefined]

The back end currently throws away the server version so this should be changed so the version is passed to the frontend.

https://github.com/RoyDefined/WebDoomer/blob/09e2beb63d585c1cee263d337416b754a138851f/src/WebDoomer/WebDoomer/Services/Zandronum/Server/Builder/ServerResultBuilder.cs#L108

https://github.com/RoyDefined/WebDoomer/blob/09e2beb63d585c1cee263d337416b754a138851f/src/WebDoomer/WebDoomer/Services/Zandronum/Server/Builder/ServerResultBuilder.cs#L125

[RoyDefined]

Rather than being able to configure profiles for a lot of different versions, perhaps just do it for the current Zandronum/QZandronum version, and a possible dev version. Dev versions are indicated with the testing binary URL, so this is already available.