1.0.0-rc-1

• Switch API to async factory class format that generates providers and exposes services.
• Introduce optional top-level "textmate-languageservices" map of language ID to path, supporting extension manifests with multiple configured languages.
  We default to ./textmate-configuration.json for one language.
• Rewrite configuration loading and service caching to occur asynchronously using native VS Code APIs.
• Rewrite folding provider to remove performance overheads in header & block folding.
• Fix external file search matching in the definition provider (which was searching files matching ./Symbol.ext before).
• Fix line token incrementation for decremented lines in the tokenizer service (FKA TextmateEngine).
• Add performance layer to Textmate scope selector parser to bypass the need for a WASM parser.