Brendan

Adds support for 'SelectableText'

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Tested on Android, iOS & Web platforms.

CompileDebug on Android fails on Flutter v2.13.0-0.2.pre (beta)

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1. Flutter Doctor ```bash [✓] Flutter (Channel beta, 2.13.0-0.2.pre, on macOS 12.3.1 21E258 darwin-x64, locale en-NG) • Flutter version 2.13.0-0.2.pre at /Users/brendan/src/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision 8662e22bac...

This PR should close issue #114 Temporary solution until merge: ```yaml ... flutter_paystack: git: url: https://github.com/definitelyme/flutter_paystack.git ref: patch/1.0.5+2 ... ```

Example usage: create a blank `Flushbar()` and manually dismiss it somewhere else. ```dart var fb = Flushbar(...); fb = fb.copyWith( mainButton: TextButton( onPressed: () { fb.dismiss(); // dismiss it here...