flutter_package / fluttertpc_get

GetInstance cleanup

- Fixes issue #521. Still needs to be tested, is a partial solution and i believe parse_route.dart requires a much deeper cleanup.
- Added a new BindingsBuilder(), to simplify the Bindings generation without the need to use a custom class.
- Modified several operators in _RxImpl and subclasses. rx.toString() solves to rx.value.toString(), and in all Rx >>= works as assignment, also specific operator overloads were added to RX versions of List, String, double, num, int.

improvement of logging, replaced print method for developer.log

- Added a fix (a little bit hacky) on DisposableInterface (rx_interface.dart), to prevent method overriding in subclasses, preventing devs to break the lifecycle of Controllers. This compensates the lack of `final` methods in Dart, or the inability to limit the scope of methods to internal packages.

- Cleanup log messages to have a more consistent format (still work to be done there).

Added localLogWriter description to polish README

Update extension structure

Conflicts:
	benchmark/state_managers/pubspec.lock
	example/pubspec.lock
	lib/src/context_extensions/extensions.dart
	lib/src/extensions/context_extensions.dart
	lib/src/extensions/string_extensions.dart
	lib/src/regex/get_utils_extensions.dart
	lib/src/utils/context_extensions/extensions.dart
	lib/src/utils/regex/get_utils_extensions.dart
	lib/utils.dart
	pubspec.lock

Added 2 new widgets to manage local state and some cleanup

- close subscription in Obx
- added the experimental ObxValue() widget to manage local states based on Rx.
- added experimental ValueBuilder(), analogue to ObxValue(), but uses a simpler StatefulWidget with a callback.

Docs updated for logWriterCallback option

Add function to get responsive value

Fix fallback locale not working if missing country code

Update route_management.md

Update dependency_management.md