Plugin Developer Tools: Plugin check & fix tool

Automated tool to discover and fix common plugin faults.

https://mclear.co.uk/2020/07/18/suggestions-for-improving-etherpad-plugins/

- [x] Adds CI and updates existing travis configs.
- [x] Adds a LICENSE
- [x] Adds a .gitignore
- [x] Adds a README and checks it includes a reference to the license
- [x] Recommends translations
- [x] Checks for files that shouldn't exist and removes them (.ep_initialized, npm-debug.log)

still to do in the distant future depending on usage.
- [ ] Check packages.json includes link to github repo
- [ ] Checks Etherpad is referred to as Etherpad Lite
- [ ] Checks README includes animated gif.

bin/plugins/lib/LICENSE.md

@@ -0,0 +1,13 @@
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

bin/plugins/lib/README.md

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+[![Travis (.org)](https://api.travis-ci.org/[org_name]/[repo_url].svg?branch=develop)](https://travis-ci.org/github/[org_name]/[repo_url])
+
+# My awesome plugin README example
+Explain what your plugin does and who it's useful for.
+
+## Example animated gif of usage if appropriate
+
+## Installing
+npm install [plugin_name]
+
+or Use the Etherpad ``/admin`` interface.
+
+## Settings
+Document settings if any
+
+## Testing
+Document how to run backend / frontend tests.
+
+### Frontend
+
+Visit http://whatever/tests/frontend/ to run the frontend tests.
+
+### backend
+
+Type ``cd src && npm run test`` to run the backend tests.
+
+## LICENSE
+Apache 2.0

bin/plugins/lib/gitignore

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+.ep_initialized
+.DS_Store
+node_modules/
+node_modules
+npm-debug.log

bin/plugins/lib/travis.yml

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+language: node_js
+
+node_js:
+  - "lts/*"
+
+cache: false
+
+before_install:
+  - sudo add-apt-repository -y ppa:libreoffice/ppa
+  - sudo apt-get update
+  - sudo apt-get -y install libreoffice
+  - sudo apt-get -y install libreoffice-pdfimport
+
+services:
+  - docker
+
+install:
+  - "bin/installDeps.sh"
+  - "export GIT_HASH=$(git rev-parse --verify --short HEAD)"
+
+before_script:
+  - "tests/frontend/travis/sauce_tunnel.sh"
+
+script:
+  - "tests/frontend/travis/runner.sh"
+
+env:
+  global:
+    - secure: "WMGxFkOeTTlhWB+ChMucRtIqVmMbwzYdNHuHQjKCcj8HBEPdZLfCuK/kf4rG\nVLcLQiIsyllqzNhBGVHG1nyqWr0/LTm8JRqSCDDVIhpyzp9KpCJQQJG2Uwjk\n6/HIJJh/wbxsEdLNV2crYU/EiVO3A4Bq0YTHUlbhUqG3mSCr5Ec="
+    - secure: "gejXUAHYscbR6Bodw35XexpToqWkv2ifeECsbeEmjaLkYzXmUUNWJGknKSu7\nEUsSfQV8w+hxApr1Z+jNqk9aX3K1I4btL3cwk2trnNI8XRAvu1c1Iv60eerI\nkE82Rsd5lwUaMEh+/HoL8ztFCZamVndoNgX7HWp5J/NRZZMmh4g="
+
+jobs:
+  include:
+    - name: "Run the Backend tests"
+      install:
+        - "mkdir [plugin_name]"
+        - "mv !([plugin_name]) [plugin_name]"
+        - "git clone https://github.com/ether/etherpad-lite.git etherpad"
+        - "cd etherpad"
+        - "mkdir node_modules"
+        - "mv ../[plugin_name] node_modules"
+        - "bin/installDeps.sh"
+        - "export GIT_HASH=$(git rev-parse --verify --short HEAD)"
+        - "cd src && npm install && cd -"
+      script:
+        - "tests/frontend/travis/runnerBackend.sh"
+    - name: "Test the Frontend"
+      install:
+        - "mkdir [plugin_name]"
+        - "mv !([plugin_name]) [plugin_name]"
+        - "git clone https://github.com/ether/etherpad-lite.git etherpad"
+        - "cd etherpad"
+        - "mkdir node_modules"
+        - "mv ../[plugin_name] node_modules"
+        - "bin/installDeps.sh"
+        - "export GIT_HASH=$(git rev-parse --verify --short HEAD)"
+      script:
+        - "tests/frontend/travis/runner.sh"
+
+notifications:
+  irc:
+    channels:
+      - "irc.freenode.org#etherpad-lite-dev"
+
+##ETHERPAD_TRAVIS_V=2