[Feature] Parameterize android support library to avoid conflicts with other plugins

[CSobol]

I'm submitting a ... (check one with "x"):

• bug report
• [ x ] feature request
• documentation issue

Feature request

• Similar to android.support library version conflicts #212, this plugin will conflict with other plugins which have hard coded the version of com.android.support they require.

• Since android >= 7.1.0 and cordova-android >= 6.3.0, cordova has provided a way to parameterize these requirements, allowing them to be specified with a switch at install, or a tag in the root project's config.xml

• This will set this plugin up to play nicely with other plugins which use the new/modern method of specifying a library, it will also allow it to play nicely with plugins which don't, by allowing the user to specify their version number. In addition, unlike the resolution to android.support library version conflicts #212, this does not require yet another cordova plugin to address the issue.

• Install instructions will need updating to reflect the available switch.

• Relevant links

  • https://blog.phonegap.com/the-play-services-problem-with-cordova-applications-489c9aeb2e89

I will be doing this work anyway to resolve an issue. Are you accepting PRs?

[Mapiac]

How is this going? Can I be of help @CSobol ?

[dpa99c]

Above commit published to npm in v4.0.12