Exthost: Integrate css-language-features plugin (onivim#957)

* Lerna monorepo

* Improve URI parsing

* Formatting

* Add extensions/package.json

* Handle activation failed message

* Add activation event for languages

* Formatting

* Update

* Add work-around for configuration not being supported

* Add detailed logging for unhandled items

* Formatting

* Set up script to install built-in extension node_modules, too

* Start test case for CSS

* Update docker build script

* Test completion

* Debug logging in built files...

* Strongly type MessageType

* Update

* Remove cancellation token from exthost

* Formatting

* Fix up css test

* Formatting

* Clean up logging

* Formatting

* Remove commented lines in js-build-steps.yml

* Update gitattributes

* Remove nested switches, replace with Option.iter + Option.iter_none

* Bring back vscode-reasonml

* Generalize document selector

* Formatting

* Remove unused toString

* Fix node lockfile

* More tweaks / logging for automation

* Move LanguageFeatures to core app state

* Set up language feature registration

* Formatting

* Set up test to wait for suggest providers to get registered

* Fix language CSS test

* Formatting

* Disable diagnostics tests for windows at the moment

.ci/js-build-steps.yml

@@ -1,17 +1,5 @@
 # Cross-platform set of build steps for building esy projects	
 
 steps:	
-  - script: node install.js	
-    displayName: 'js deps: npm install'	
-    workingDirectory: node
-  - script: npm run build	
-    displayName: 'js deps: npm build'	
-    workingDirectory: node
-#  - script: npm run test	
-#    displayName: 'textmate: npm test'	
-#    workingDirectory: src/textmate_service	
-  - script: rimraf node/node_modules
-    displayName: 'js deps: remove developer node_modules'	
-  - script: node install.js --prod	
-    workingDirectory: node
+  - script: node install-node-deps.js --prod	
     displayName: 'js deps: npm install --prod'

.gitattributes

@@ -7,3 +7,6 @@
 
 # Hide lockfile updates
 *esy.lock/* linguist-generated
+
+# Hide vendored extension code
+extensions/css-language-features/* linguist-generated

docs/docs/for-developers/building.md

@@ -28,14 +28,13 @@ esy bootstrap
 esy build
 ```
 
-### Build the back-end
+### Install node dependencies
 
 ```sh
-cd node
-node install.js
+node install-node-deps.js
 ```
 
-> __NOTE:__ The non-standard `node install.js` step instead of `npm install` is necessary because the script picks up our _vendored_ node binary - and the native dependencies for the textmate service rely on being built with the same version of node that it uses at runtime.
+> __NOTE:__ The non-standard `node install-node-deps.js` step instead of `npm install` is necessary because the script picks up our _vendored_ node binary.
 
 ### Run health-check