Improve group message ui
Add cache timestamp and update submodules
v1.6 Update icons and improve ui
Use new upload api:replace file if exist
Fix some bugs
1. Fix server certificate change
2. Fix new group message display
Update icons
Fix photo selection limit
Add photos browser
Impove code quality
Clear unused code and improve user msg input view
Fix some bugs and add eror image
Fix browser photos error while fullscreen, improve messageinput view,
    adjust message view avatar offset
Update i18n
Fix long press file crash
Do not save the certicates of trusted certificate
Send share link do not need to download file
Fix "Generate Share Link" stays
Update i18n en
Fix photo zoom while fullscreen
Update i18n and upgrade to v1.7