#524: add more sort method and view method

[lidaobing]

1. add more sort methods: username / host / last_activity
2. support select info style: IP / username / host / last_activity / last_message
3. update last_activity after midnight
4. add sort menu to the context menu of main window

[codecov]

Codecov Report

Attention: Patch coverage is 63.37580% with 115 lines in your changes are missing coverage. Please review.

Project coverage is 47.08%. Comparing base (7838f30) to head (27e3f3e).

Files	Patch %	Lines
src/iptux/UiModels.cpp	59.86%	61 Missing ⚠️
src/iptux/MainWindow.cpp	61.29%	48 Missing ⚠️
src/iptux/UiHelper.cpp	83.33%	3 Missing ⚠️
src/iptux/UiModels.h	33.33%	2 Missing ⚠️
src/iptux/UiCoreThread.cpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   45.63%   47.08%   +1.44%     
==========================================
  Files          61       63       +2     
  Lines        7901     8068     +167     
==========================================
+ Hits         3606     3799     +193     
+ Misses       4295     4269      -26     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.