Hidden files / folders, improved synchronization & support requests

Improvements for all users:

• Files and folders with name starting with a . will now be ignored by
  default. We used to blacklist a few special hidden files and folders, but it
  didn't prove an efficient way to prevent unsupported use cases and issues. So
  we decided to go the opposite way. Please report specific issues with as many
  context as possible so we can understand the actual need.
• When sending a support request from the app, your logs are now uploaded
  directly to our own servers. They're not sent by email anymore, so it should
  work even with huge files (although the upload may take some time).
• The app now detects and handle a few file and folder deletion events
  miscategorized by a third-party component (very rare bug).
• A few users where looking for the CLI, not knowing it was actually disabled.
  The documentation was updated to reflect this.

Improvements for Windows and macOS users:

• When taking a folder with a platform-compatible name, renaming it with a
  platform-incompatible name then renaming it back to a compatible one, files
  were still not synced back (it worked in other cases though). This issue is
  fixed now.

Improvements for Windows users:

• We added UI traces to help us spot a weird issue: at least 2 Windows users
  recently reported blank windows when starting the app (at least one of them
  solved the issue by switching to automatic video card selection, but we're
  still investigating). In case you encountered this issue, please try again
  with this new release and send us a support request from the app.

See also known issues.

Happy syncing!