Maxthon 3.4.5.1000

# New Features:
* Supported logging in Maxthon Account with connected Facebook and Twitter accounts
* Supported opening internal pages of chm files
* Added Certificate Management entrance in Maxthon Options
# Fixes:
* Part of high CPU and memory usage problems
* Freeze problem caused by right-clicking on a selected long form
* Fixed problems when exited the browser or about process remain
* Crash problems caused by WebGL
* Crash problems caused by Reader Mode
* Display and crash problem of Print Preview
* Messy code problem in some sites
* Messy code problem when used Multi Search
* Tab inverse order problem of Last Session
* Drag & Drop invalidation problem in some pages
# Improvements:
* Improved the support for HTML5 Notifications
* Improved Extension Platform
* Improved Last Session
* Improved saving feature of Developer Tool
* Improved the Night Mode effect in some sites
* Improved the scrolling efficiency in the page with big size images or amounts of images
* Optimized the memory usage of Quick Access
# UI Improvements:
* Added "Extension List" switch into MX Cloud Sync Center
* Search suggestion list in Search Bar
* Magic Fill list in Maxthon Options
* Fixed the display status problem of Tool Bar