Allow user to set path to ra_lsp_server in vscode settings

editors/code/src/config.ts

@@ -4,6 +4,7 @@ import { Server } from './server';
 
 export class Config {
     public highlightingOn = true;
+    public raLspServerPath = 'ra_lsp_server';
 
     constructor() {
         vscode.workspace.onDidChangeConfiguration(_ =>
@@ -21,5 +22,9 @@ export class Config {
         if (!this.highlightingOn && Server) {
             Server.highlighter.removeHighlights();
         }
+
+        if (config.has('raLspServerPath')) {
+            this.raLspServerPath = config.get('raLspServerPath') as string;
+        }
     }
 }