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/README.md

@@ -0,0 +1,46 @@
+The files in this folder are for Plugin developers.
+
+# Get suggestions to improve your Plugin
+
+This code will check your plugin for known usual issues and some suggestions for improvements.  No changes will be made to your project.
+
+```
+node bin/plugins/checkPlugin.js $PLUGIN_NAME$
+```
+
+# Basic Example:
+```
+node bin/plugins/checkPlugin.js ep_webrtc
+```
+
+## Autofixing - will autofix any issues it can
+```
+node bin/plugins/checkPlugins.js ep_whatever autofix
+```
+
+## Autocommitting, push, npm minor patch and npm publish (highly dangerous)
+```
+node bin/plugins/checkPlugins.js ep_whatever autofix autocommit
+```
+
+# All the plugins
+Replace johnmclear with your github username
+
+```
+# Clones
+cd node_modules
+GHUSER=johnmclear; curl "https://api.github.com/users/$GHUSER/repos?per_page=1000" | grep -o 'git@[^"]*' | grep /ep_ | xargs -L1 git clone
+cd ..
+
+# autofixes and autocommits /pushes & npm publishes
+for dir in `ls node_modules`;
+do
+# echo $0
+if [[ $dir == *"ep_"* ]]; then
+if [[ $dir != "ep_etherpad-lite" ]]; then
+node bin/plugins/checkPlugin.js $dir autofix autocommit
+fi
+fi
+# echo $dir
+done
+```