Release version 2.4
Changelog
Update: target PDF.js v4.1: support Stamps and Highlights
Feature: enable non-viewer integration and general usage
Refactor: separate the theme engine, components into modules
Refactor: make awaiting PDF.js eventBus reusable
Improvement: wrap setters to proactively calculate styles
Improvement: drop storing canvas, minimize checking background
Fix: map colors to gradient if no accents were provided