The issue describes a list of proposal for API breaking changes

@ui5/webcomponents-base

@ui5/webcomponents

<ui5-input>

• should the input event bubble - currently, it doesn't.
• change open/close events of drop-down components to non-bubbling

<ui5-select>

• ? Promote Select's value, remove Option's selected ?

<ui5-split-button>

• rename event arrow-click to arrow-button-click
• rename property activeArrowButton to arrowButtonPressed

Popups

• remove before-open, keep open, before-close and close

@ui5/webcomponents-fiori

@ui5/webcomponents-tools

• remove wdio tests tools, support cypress only
• remove hbs template tools, support jsx templates only

@ui5/webcomponents-icons

• remove clinical-tast-tracker icon