ribir-v0.4.0-alpha.19

Features

• core: Added grab_pointer to grabs all the pointer input. (#669 @wjian23)
• widgets: Added the widget of Slider (#669 @wjian23)

Fixed

• core: fix mismatch of providers. (#669 @wjian23)
• core: Added DeclarerWithSubscription to let Widget Expanded accept pipe value. (#669 @wjian23)