pro：优化单例启动。

SingleApplication-3.5.2/.gitignore

@@ -0,0 +1,17 @@
+/.idea
+/examples/*/*.o
+/examples/*/Makefile
+/examples/*/moc_*.cpp
+/examples/*/moc_predefs.h
+/examples/*/*.qmake.stash
+/examples/basic/basic
+/examples/calculator/calculator
+/examples/sending_arguments/sending_arguments
+/**/CMakeLists.txt.user
+/**/CMakeCache.txt
+/**/CMakeCache/*
+/**/CMakeFiles/*
+/**/Makefile
+/**/cmake_install.cmake
+/**/*_autogen/
+libSingleApplication.a