[FEAT] Support for Custom Godot Build Installation via SymLink

[imLymei]

Description

A basic implementation of my requested feature #102.

It probably has a lot of room for improvement since C# isn't my main language. Nevertheless it should be a good starting point.

Know Problems

• Dependencies do not load with the SymLink.
• Crash on godot list (System.NullReferenceException: Object reference not set to an instance of an object.)
• Custom Build not being identified as "selected" on godot list

[jolexxa]

Thank you for the contribution!! @wlsnmrk is in the middle of updating how we handle versions to fix some known edge cases, so we may need to ask you to be patient with us for a bit while we sort that out first before we can get to this.

[imLymei]

Sure! I’ll wait for this update before making major changes. In the meantime, I’ll focus on how to adapt this process to accommodate as many types of custom builds as possible. Any and all ideas are welcome!

[wlsnmrk]

@imLymei Thanks for your patience! We're done (hopefully) with the updates I was working on, so please feel free to proceed with any changes. With any luck, the new updates may help address some of the known issues you mentioned in your first post here.

[imLymei]

Thanks! I'll be resuming the development.