RCORE: add bindable.hh and bindable.cc
UI: add binding.hh and binding.cc
RCORE: add binding basics: BindablePath BindableIface BindableAdaptor BinadableAccessor
UI: add BindableRelay prototype
UI: introduce "Object" as base type for all IDL interfaces
UI: introduce Widget::data_context()
UI: add class Binding prototype
UI: add Widget API for add_binding() and remove_binding()
UI: support "@bind propertyname" syntax in UI XML declarations
PYTESTS: start test program for data bindings
UI: make ScreenWindow::show() also raise the newly shown window
UI: present the initial window as active window
UI: introduce foreach_recursive() to iterate over hierarchy branches
RCORE: fix Signal::Connector visibility
RCORE: add Signal and slot() from Aida to the Rapicorn namespace
RCORE: add BindableIface::sig_bindable_notify to allow callback notifications
UI: update bindings when Widget::data_context changes
UI: add BindableRelayImpl implementation
ROPE: provide Rapicorn.Bindable decorator
PYTESTS: use Rapicorn.Bindable for sample ObjectModel