Bindable (#36)

* injectool is upgraded

* Observable is renamed to Bindable

* observable module is renamed to bindable

* expression is moved to core

* imports refactoring

* expression refactoring

* ObjectNode is moved to binding package

* added BindableDict, NodeGlobals classes

* expression binding refactoring

* updated changelog

* fixed expressiont scope

* added some typings

* refactoring

* setup modules are renamed to config

* added parse function to core xml module

* core.binding refactoring

* rendering.common is renamed to rendering.context

* updated version, fixed ci

* removed 3.12 python version from workflow

* added dataclasses dependency for python 3.6

version 3.2.0

3.1.0 version

3.0.1 version

updated changelog version

2.3.0 version

2.2.0 version

2.1.1 version

2.1.0 version

2.0.4 version