RoosterJs Content Model 0.28.0 and RoosterJs 8.61.0

Create a standalone editor on top of Content Model

• Reorganize source code (#2464)
• Add quote feature to Content Model editor (#2461)
• Add shortcut for arrow keys (#2470)
• Add function normalizeRect(#2482)
• Add AutoLink feature (#2479, #2485)
• Clean up core API (#2481)

Improvements

• Support "("+trigger character in PickerPlugin (#2478)
• Merge BlockFormat when merging the first paragraph (#2477)
• Remove LinkHeight limitation when pasting from Word (#2483)
• Respect "shouldPersist" from EntityOperationEvent
• Export content without selection (#2491)
• Fix TableEditPlugin anchorContainerSelector query (#2499)
• Add check for selected segments and paragraphs (#2476)
• Watermark plugin allows update watermark text (#2507)

Other improvement

• Demo site is now using Content Model editor by default (#2462, #2465, #2466, #2467, #2468, #2489, #2496)
• Clean up build script and other files (#2469)
• Stop using default export (#2471)
• Fix unstable tests (#2475, #2487, #2488)