Major JUCE features and updates

This file lists the more notable headline features. For more detailed info
about changes and bugfixes please see the git log and BREAKING_CHANGES.md.

Version 9.0.3

• Added support for reading and writing Opus files
• Added support for WebP image files
• Updated Windows MIDI Services support to the in-box preview 7 API
• Fixed multiple Linux ALSA sample rate and channel issues
• Fixed Windows window placement and focus issues
• Fixed cancelling blocking network requests on macOS
• Fixed some OpenGLFrameBuffer issues
• Allowed recursive scanning for LV2 plug-ins