AAB build and sign support for Android, compile constants support and other improvements

[inikityuk]

Hey @voydz,

Had a bit of time recently to update your plugin. Major changes are:

1. Android: added ability to build AAB files (including signing)
2. Android: added support to projects with multiple AndroidManifest files (handy if your build configuration using different ones)
3. Android: added "key-password" signing property (handy if "store password" doesn't match with "key password")
4. Android/iOS: added support for compile constants (handy if you using them as switches in projects)
5. iOS: added ability to specify provisioning profile to sign with
6. Updated readme with most common properties and basic usage

NOTE: this PR will resolve few open issues: https://github.com/voydz/souyuz/issues/34 https://github.com/voydz/souyuz/issues/33

Happy to keep it updated for some time if any new issues come up.

[inikityuk]

Feels like "souyuz" is not supporting this repo, I'm going to create separate plugin for fastlane with current modifications. For anyone looking to build Xamarin apps for Android (APK or AAB) or iOS can fork or pull all new changes from "inikityuk"