Feature request: When loading remote version, append the prefix "v" if not set.

Feature for consideration:

Sometimes users get confused when setting remote versions, as they believe the version starts at the number not the "v". It may be a good idea to ensure the v prefix is set before trying to download the remote solc-js file.

https://github.com/juanfranblanco/vscode-solidity/issues/138

I can obviously force it on vscode but the naming standard might change in the future.

Start by locating the code that loads remote solc-js files and trace how the requested version is converted into a download URL. Compare the expected version naming with the linked vscode-solidity issue, then verify that versions with and without the prefix resolve consistently.

Written by the indexing model from the issue text.