1.6.0

[GarboMuffin]

• [x] addon fixes
• [x] reverted max SVG resolution due to excessive crashes
• [x] SVG rotation center preservation
• [x] https://github.com/TurboWarp/scratch-gui/issues/574
• [x] https://github.com/TurboWarp/packager/pull/481
• [x] "packaged runtime" mode by default
• [x] some addon fixes
• [x] sound editor things - batch 1
• [ ] sound editor things - batch 2???
• [x] file saving reliability improvements
• [x] zebra striping
• [x] pick colors from stage
• [ ] costume editor file size indicator???
• [ ] bitmap transparency???