WPS Feature Updates

- Unified all activation channel as using Product Key to activate. - Optimized the activation page.
New features to Cloud Storage Service
- We added cloud storage service entrance under the Open Tab. - Now you can authorize the use of DropBox, and edit and update the files in the cloud disk.
Improvements of PDF tools
- We combine the original two expandable boxes on the right side into one, leaving a larger file editing and browsing area.
New features to Presentation
- Now we added a screen recording plug-in, to record the slide playback of your presentation.
User experience improvements
- Programme stability improvemetns and bug fixes.