Integrating SoftParser: Enable SoftParser in RalphLangServer

[simerplaha]

• Enables go-to-definition provider for SoftAST.
• The CodeProviders for both Strict and Soft ASTs are processed in parallel and unique results from both are returned.
• Since SoftParser is WIP, it is optionally enabled via the enableSoftParser flag (default value is false). Maybe this should be a build configuration in ralph.json until test-cases are complete?

  "experimental": {
    "enableSoftParser": true
  }

• Parser errors prevent CodeProvider execution (completion, goto definition etc) #104

[tdroxler]

Maybe this should be a build configuration in ralph.json

That could be nice so we can easily try it out without needed to build locally.

But maybe it's a bit too much work and we could release rc version with the feature enabled?

[tdroxler]

Maybe this should be a build configuration in ralph.json

That could be nice so we can easily try it out without needed to build locally.

But maybe it's a bit too much work and we could release rc version with the feature enabled?

but could be done in a next PR