v3.0.4 with one-click app updates

[New] One-click update
[New] More update sources
[Improved] Move framework files to app/Core directory
[Improved] Decide storage unit automatically
[Improved] Use SQL to calculate storage used
[Improved] Use callout instead of alert
[Improved] Adjust column size at customize page
[Improved] Enhance selection of texture type at upload page
[Fixed] Bug of migrations
[Fixed] Route of /index.php
[Fixed] Escaping release note
[Fixed] Clearing textures of player, close #31
[Fixed] Pagination url when searching by uid
[Fixed] Bug of register and deleting account