* Remove most SyncDescriptorX forms
From what I can tell, `SyncDescriptor0` is the only one of these types still being used. In order to speed up TS's type checking around `createInstance`, I think it makes sense to remove the unused forms
* Remove `SyncDescriptorN` from tree shaker usages
Co-authored-by: Alex Dima <alexdima@microsoft.com>
Tree Shaking:
- do not proceed with tree shaking when there are compilation errors
- load .d.ts files in the language service
- adopt TS 3.1.1 in symbol resolution
- use the real tsconfig.json / with "node" resolution
Bundling:
- fix issue where files were being looked for in out-build instead of out-editor-build
