Thunder 5.6.0.280 Beta- Supports BT protocol download

Update information

* Support BT protocol download

* Optimized the layout of new panels

* Fixed a BUG where the number of half-open connections was too low

* Fixed a BUG where the batch download comment name would not be passed

Note: This release is Beta and has some known issues, including

1. The download speed (for example, the download speed is greater than 400k/s) consumes too many resources

2. The BT task attributes cannot be modified during download

3. There are compatibility problems with Vista

4. BT task suspension is relatively slow