add option to enable fast update in settings widget

latest
Status Job ID Name Coverage
  Test
passed clang-c++11-Qt4 #2604
Linux MultiThreads

00:07:21

passed clang-c++11-Qt5 #2608
Linux MultiThreads

00:09:13

passed clang-c++98-Qt4 #2606
Linux MultiThreads

00:06:55

passed clang-c++98-Qt5 #2610
Linux MultiThreads

00:08:08

passed gcc-c++11-Qt4 #2603
Linux

00:04:53

passed gcc-c++11-Qt5 #2611
Linux

00:03:45

passed gcc-c++98-Qt4 #2605
Linux

00:02:56

passed gcc-c++98-Qt5 #2609
Linux

00:03:19

canceled gcc-c++11-Qt5 #2607
Linux

09:29:49