hasPermission on Android and enhanced getToken on iOS

• IOS_FIREBASE_MESSAGING_VERSION upgraded to 7.4.0;
• FCM.hasPermission now supports Android;
• On iOS, getToken will now wait until fcm token is defined to return it;
• FCM.getInitialPushPayload now uses UTF8 instead of ISOLatin;

Downgraded Cordova and Cordova-Android minimal required versions.

With this update, the plugin will be able to be installed on older versions of cordova and android cordova.

Thanks to @DuaneQ for asking the support for cordova v8.1.1.

Fixed auto install of ionic-specific dependencies on Windows

Included windows-specific fix. Thanks to @Allisson95 for creating the PR #207

Added IOS_FIREBASE_MESSAGING_VERSION plugin preference

Now --variable IOS_FIREBASE_MESSAGING_VERSION=... can be used to specify the iOS pod Firebase/Message version used.

Cordova projects, Ionic dependencies are skipped

For pure Cordova projects, Ionic dependencies are skipped for "ionic", "ionic/ngx" and "ionic/v4".

Upgraded Android and Noide dependencies

Simple maintenance update.

Avoided Android's initialPushPayload being set from data notifications

Android: Avoided setting initialPushPayload from a non-tapped notifications.

Special thanks to @lena0204, for finding this bug.

Removed optional Firebase/Analytics iOS dependency.

Removed dependency Firebase/Analytics from https://github.com/andrehtissot/cordova-plugin-fcm-with-dependecy-updated/blob/master/plugin.xml

As described in: https://firebase.google.com/docs/cloud-messaging/ios/client#add-sdks

Special thanks to @aml25 for pointing it out.

Added deleteInstanceId()

Added deleteInstanceId to allow user's "resetting" Firebase session (https://firebase.google.com/support/privacy/manage-iids#delete_an_instance_id).

Special thanks to @dgonzalez870, for requesting such a feature.

Small miscellaneous refactoring

iOS: Values sent as notification on push payload should never overwrite values sent as data.

Android: tapping action small refactor.

Ionic: Removed [email protected] dependency due to reported incompatibility (thanks to @aminbenab for reporting)