Assets 3

Add support for alternative language servers like RLovelett/langserver-swift #21

Probably Apple's recently announced language server will be supported, too. See https://forums.swift.org/t/new-lsp-language-service-supporting-swift-and-c-family-languages-for-any-editor-and-platform/17024 for more infos.

If you prefer RLovelett's LangserverSwift, SDE will read your old swift.languageServerPath-config. In order to actually use it your need to set sde.languageServerMode to langserver.