Maxthon 3.4.5.600 Beta

# New Feature:
* Added the Certificate Management in Maxthon Options
# Fixes:
* High CPU and memory usage problem
* Freeze problem caused by right-clicking on a selected long form
* Crash problem caused by Reader Mode
* Messy code problem when used Multi Search
* Tab inverse order problem of Last Session
* Messy code problem in some sites
* Drag & Drop invalidation problem in some pages
* Display and crash problem of Print Preview
# Improvements:
* 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:
* Search suggestion list in Search Bar
* Magic Fill list
* Fixed the display status problem of Tool Bar