mdbook_incremental_preview-v0.0.4

Added

• (lsp) ignore file watch event for opened files
• (lsp) open browser at opened chapter
• (patching) use PatchJoinSets
• (patching) MDBookCore to overtake&share preprocessing
• (rebuilding) two-JoinSet to keep oldest+newest rebuilds;

Other

• reduce cloning w/ Arc
• LivePatcher → Previewer