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 8.0.15

• Fixed the behaviour of loadFromHexString
• Fixed multiple Windows GUI scaling issues
• Updated Oboe to 1.10.0
• Improved handling of OpenGL textures
• Fixed a DropShadow issue with a tiny radius