[refactor] add namespace 'crossdesk' to codebase

src/screen_capturer/linux/screen_capturer_x11.cpp

@@ -6,6 +6,8 @@
 #include "libyuv.h"
 #include "rd_log.h"
 
+namespace crossdesk {
+
 ScreenCapturerX11::ScreenCapturerX11() {}
 
 ScreenCapturerX11::~ScreenCapturerX11() { Destroy(); }
@@ -171,4 +173,5 @@ void ScreenCapturerX11::OnFrame() {
   }
 
   XDestroyImage(image);
-}
+}
+}  // namespace crossdesk