Syncthing 2.0.0 (64-bit)

What's new in this version:

Fixed:
- fix(db): handle large numbers of blocks in update
- fix(syncthing): make directory flags global for all commands
- fix(sqlite): apply options
- fix(db): version vector serialisation :(
- fix(model): loop-break regression while block copying in puller
- fix(model): close fd immediately in copier
- fix(model): use same folder first in copier
- fix(model): correct bufferpool handling; simplify
- fix(protocol): avoid deadlock with concurrent connection start and close
- fix(syncthing): avoid writing panic log to nil fd
- fix(fs): check for unsupported error on modern Windows
- fix(gui): don't show dial errors for paused devices
- fix: track invalid files in LocalFlags to fix global count
- fix(watchaggregator): properly handle sub-second watch durations
- fix(db): remove invalid member from FileMetadata
- fix(model): avoid flashing "Sync Waiting" unnecessarily
- fix(protocol): slightly loosen/correct ownership comparison criteria
- fix(model): don't clobber local flags when receiving index
- fix(beacon, osutil, upnp): fix local discovery send and intf detection on Android
- fix(pmp, netutil): workaround native code denied to discover gateway ipv4 addr on Android 14+
- fix: allow deleted files to win conflict resolution
- fix(gui): show revert buttons only when folder is idle
- fix(gui): fix identicon generation
- fix(model): properly set folder state "syncing" when copying data
- fix(slogutil): quote values with parentheses in them
- fix(test): remove lib/logger from testmocks target
- fix: correct logging of our ID after startup & generate

Features:
- feat: add syncthing debug database-statistics command
- feat(config): enable multiple connections by default
- feat(config): expose folder and device info as metrics
- feat: use Ed25519 keys for sync connections
- feat(gui): add option to limit bandwidth in LAN to Settings (ref #10046)
- feat(connections, nat): add UDP portmapping/pinhole for QUIC
- feat: add debug commands for folder counts and files
- feat(ignore): add .stignore escaping on Windows
- feat: switch logging framework

Other:
- chore: remove abandoned next-gen-gui experiment
- chore: remove weak hashing which does not pull its weight
- chore: switch database engine to sqlite
- chore: harmonise command line flags
- chore(db): increase journal limit to 64MiB
- chore: forget deleted files older than six months
- chore(db): use shorter read transactions and periodic checkpoint for smaller WAL
- chore: configurable delete retention interval
- chore(db): fix debug logging
- chore(db): buffer pulled files for smaller WAL
- chore(db): use one SQLite database per folder
- chore(model): delay starting a pull while there are incoming index updates
- chore(syncthing): remove "default" folder concept
- chore(syncthing): ensure migrated database is closed before exiting
- chore(db, model): simplify per hash DB lookup in copier
- chore(model): refactor copier for more flatness
- build: upgrade setup-zig action
- build: properly propagate build tags to Debian build
- chore(protocol): don't start connection routines a second time
- chore(protocol): only allow enc. password changes on cluster config
- chore: various linter fixes