Version 0.7

Changes since last version:

• Support for EXR layers and multi-part
• Support for EXR channel names and integer format
• Minor UI redesign and better performance

Development changes:

• Upgrade to Qt6
• C++17 is now required (Visual Studio 2019+, GCC 7.5+)
• Build scripts are now using CMake instead of qmake
• Replaced EXR library (might be temporary)