析构时，deleteCamera增加handle置位的操作，防止重复关闭报错

chenshijun

2019-07-29 69895028b74737228e76005f88b9aaf95136ec96

 .gitignore

@@ -5,17 +5,21 @@
*.obj

# Compiled Dynamic libraries
*.so
#*.so
*.dylib
*.dll

# Compiled Static libraries
*.lai
*.la
*.a
#*.a
*.lib

# Executables
*.exe
*.out
*.app

/build
.idea
.vscode