docs: add v5.0.0 release notes

Author: dertwist

.github/RELEASE_NOTES_v5.0.0.md

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+## 📄 Dev versions
+
+* Every commit now triggers an automatic build of the application at this link: [https://github.com/dertwist/Hammer5Tools/releases/tag/dev](https://github.com/dertwist/Hammer5Tools/releases/tag/dev)
+
+## ✏️ SmartProp Editor
+
+- Added `Material` variable type
+- Added `Material replacement` property
+- Added undo/redo support for variable additions, deletions, and edits (choices have limited undo history support)
+- Added drag-and-drop reorder support for modifiers and selection criteria
+- Improved property undo with incremental updates instead of full rebuilds
+- Extended variable handling in choices to support `string` and `vector3d` types
+- Added warning property for unverified functionality
+- Optimized property widget pooling and completion cache handling
+- Implemented asynchronous property frame initialization and batch processing
+
+## 🔊 SoundEvent Editor
+
+- Added a history dock for visualizing the undo/redo action history
+- Added a soundevent player widget
+- Added **Internal Soundevent Explorer** with context menu integration (copy, play, preview)
+- Added multi-select support in the explorer with a context menu for copying asset names
+- Added bulk paste for file paths from clipboard in the Files property
+- Added duplicate sound events command
+- Enhanced undo functionality with property deletion tracking
+- Minor fixes and tooltips improvements
+- Added clipboard paste and expand/collapse functionality to the property editor
+
+## 🖼️ Loading Editor
+
+- Added SVG rescaling functionality with fixed output dimensions
+- Added new checkbox and tips UI for SVG rescaling