The main task in this issue is probably identifying the steps towards full LSP support.

Features for first release (mainly related to file lookup):

• cwd should not matter for loading files / resolving paths
• loading a single file with only relative imports should work without any configuration
• it should be possible to configure root path and include paths
• internal names cannot have file:// prefix due to absolute / direct imports, so we need translation functions
• the server needs the ability to load files from disk itself (didOpen just means the client provides a "content override" to the server)

Features for subsequent releases (probably implemented in the client, but we should support it as much as possible):

• node_modules should be auto-detected as an include path as much as possible
• files synthesized by truffle should work (may need to invoke truffle to get it)
• we should standardize the way how frameworks configure the language server, so this does not have to be implemented in all clients