software/theia: update to 1.9.0 and update extensions

Update to 1.9.0 ( https://github.com/eclipse-theia/theia/blob/v1.9.0/CHANGELOG.md#v190---16122020 )

Update extensions to newer version and to the URLs from openvsx instead of
github, since openvsx prevent maintainers to modify releases.

Also use buildout directly to download extensions, so that we verify signatures and have possibility to use cache

See merge request nexedi/slapos!873

software/theia/buildout.hash.cfg

@@ -19,7 +19,7 @@ md5sum = a3e4cb7d28daa7816f04359c8aa3445b
 
 [yarn.lock]
 filename = yarn.lock
-md5sum = 5a89742266a9f9d4115efa6d641fd5bb
+md5sum = e4b8d436916e48d354342894d6ffecb7
 
 [python-language-server-requirements.txt]
 filename = python-language-server-requirements.txt

software/theia/generate_download_plugins_cfg.py

+import configparser
+import requests
+import hashlib
+
+urls = []
+
+for plugin_and_version in '''\
+    vscode/bat/latest
+    vscode/clojure/latest
+    vscode/coffeescript/latest
+    vscode/configuration-editing/latest
+    vscode/cpp/latest
+    vscode/csharp/latest
+    vscode/css/latest
+    vscode/css-language-features/latest
+    vscode/debug-auto-launch/latest
+    vscode/docker/latest
+    vscode/emmet/latest
+    vscode/fsharp/latest
+    vscode/go/latest
+    vscode/groovy/latest
+    vscode/grunt/latest
+    vscode/gulp/latest
+    vscode/handlebars/latest
+    vscode/hlsl/latest
+    vscode/html/latest
+    vscode/html-language-features/latest
+    vscode/ini/latest
+    vscode/jake/latest
+    vscode/java/latest
+    vscode/javascript/latest
+    ms-vscode/js-debug/latest
+    vscode/json/latest
+# latest json-language-features does offer completions with .theia/settings.json
+    vscode/json-language-features/1.45.1
+    vscode/less/latest
+    vscode/log/latest
+    vscode/lua/latest
+    vscode/make/latest
+    vscode/markdown/latest
+# https://github.com/eclipse-theia/theia/issues/7780
+    vscode/markdown-language-features/1.39.1
+    vscode/merge-conflict/latest
+    vscode/npm/latest
+    ms-vscode/node-debug/latest
+    ms-vscode/node-debug2/latest
+    vscode/objective-c/latest
+    vscode/perl/latest
+    vscode/powershell/latest
+    vscode/pug/latest
+    vscode/python/latest
+    vscode/r/latest
+    vscode/razor/latest
+    vscode/ruby/latest
+    vscode/rust/latest
+    vscode/scss/latest
+    vscode/shaderlab/latest
+    vscode/shellscript/latest
+    vscode/sql/latest
+    vscode/swift/latest
+    vscode/theme-abyss/latest
+    vscode/theme-defaults/latest
+    vscode/theme-kimbie-dark/latest
+    vscode/theme-monokai/latest
+    vscode/theme-monokai-dimmed/latest
+    vscode/theme-quietlight/latest
+    vscode/theme-red/latest
+    vscode/theme-solarized-dark/latest
+    vscode/theme-tomorrow-night-blue/latest
+    vscode/typescript/latest
+    vscode/typescript-language-features/latest
+    vscode/vb/latest
+    vscode/vscode-theme-seti/latest
+    vscode/xml/latest
+    vscode/yaml/latest
+    EditorConfig/EditorConfig/latest
+    dbaeumer/vscode-eslint/latest
+    ms-vscode/references-view/latest
+    golang/Go/0.16.2
+    vscjava/vscode-java-debug/0.29.0
+    redhat/java/0.61.0
+    vscjava/vscode-java-test/0.26.0
+    ms-python/python/2020.9.112786
+    perrinjerome/vscode-zc-buildout/latest
+    jebbs/plantuml/2.13.12
+    rafaelmaiolla/diff/latest
+    perrinjerome/git-commit-syntax/latest
+    perrinjerome/git-rebase-syntax/latest
+'''.splitlines():
+  plugin_and_version = plugin_and_version.strip()
+  if not plugin_and_version or plugin_and_version.startswith('#'):
+    continue
+  publisher, extension_name, version = plugin_and_version.split('/')
+
+  api_url = f'https://open-vsx.org/api/{publisher}/{extension_name}/{version}'
+  download_url = requests.get(api_url).json()['files']['download']
+  md5sum = hashlib.md5(requests.get(download_url).content).hexdigest()
+  urls.append(f'{publisher}-{extension_name} {download_url} {md5sum}')
+
+cfg = configparser.ConfigParser()
+cfg.add_section('theia-download-plugins')
+cfg.set('theia-download-plugins', 'urls', '\n'.join(urls))
+
+with open('download-plugins.cfg', 'w') as f:
+  f.write(f"""\
+# This file is automatically generated from {__file__}
+# Do not edit directly.
+""")
+  cfg.write(f)