Outline view: wire in Theia outline-view for program structure

- add @theia/outline-view 1.75.0 to browser and electron apps
- side panel Outline renders documentSymbol data already served by
  the Modula-2 language server (variables, procedures with params)

apps/browser/package.json

@@ -10,6 +10,7 @@
     "@theia/messages": "1.75.0",
     "@theia/monaco": "1.75.0",
     "@theia/navigator": "1.75.0",
+    "@theia/outline-view": "1.75.0",
     "@theia/plugin-ext-vscode": "1.75.0",
     "@theia/preferences": "1.75.0",
     "@theia/process": "1.75.0",

apps/electron/package.json

@@ -12,6 +12,7 @@
     "@theia/messages": "1.75.0",
     "@theia/monaco": "1.75.0",
     "@theia/navigator": "1.75.0",
+    "@theia/outline-view": "1.75.0",
     "@theia/plugin-ext-vscode": "1.75.0",
     "@theia/preferences": "1.75.0",
     "@theia/process": "1.75.0",