flutter_package / fluttertpc_get

docs(english): translating recent pt-br changes in docs to english

also added the docs in the spanish doc

Rx equality fix

- fixed types in equality operator, added hashCode override to return rx.value.

docs changes

Update README-es.md

- fixed code sample in simple_builder.dart
- Added docs for ValueBuilder and ObxValue

General cleanup, more docs.

- Added a Navigation. methods references in docs, for easier understanding of the names.

- improved comments.

Simple bool notation

[Docs] Document how to update observable class

- Added SingleGetTickerProviderMixin to rx_interface.dart, usage like SingleTickerProviderMixin in a StatefulWidget, but only valid for DisposableInterfaces.