[feat] Actionable notifications

[roman-rr]

PR Type

Add actionable types and categories for push notifications
iOS Guidelines

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation changes
• Other... Please describe:

PR Checklist

For bug fixes / features, please check if your PR fulfills the following requirements:

• Testing has been carried out for the changes have been added
• Regression testing has been carried out for existing functionality
• Docs have been added / updated

What is the purpose of this PR?

Using Actionable Notifications

Does this PR introduce a breaking change?

• Yes
• No

How to use

1. Add pn-actions.json file into root of cordova project

{
  "PushNotificationActions": [
    {
      "category": "news",
      "actions": [
        {
          "id": "read", "title": "Read"
        },
        {
          "id": "skip", "title": "Skip"
        },
        {
          "id": "add", "title": "Add to list"
        }
      ]
    }
  ] 
}

2. Inject line to config.xml

<resource-file src="pn-actions.json" />

3. Add click_action to your GCM notification payload

 "notification" : {
     "body" : "Body of Your Notification",
     "title": "Title of Your Notification",
     "click_action": "news"
 }

Done!

[dpa99c]

Thanks for this, I have cherrypicked, documented and merged to master