Fix file watching

• Rewrote File watcher
  • Now only uses a single, global native watcher (instead of n)
  • Now only spawns one global thread (instead of 2 * n)
  • No longer re-creates watchers for files that are already monitored
  • No longer throws exceptions or deliberately crashes on native API errors

added bug label

added 1 commit

• 191c7d40 - Retry on empty win32 response instead of shutting down thread

Compare with previous version

mentioned in commit 351030b1

merged