iOS: Fix a crash in HandyFTP, an additional check I put in for dw_window_get_text() made it return NULL on 0 length strings. Also fix main thread API check warnings for calling updateMenu: by creating a safeCall: method to do it from any thread. Add code to cleanup after splitbar and notebook controls.

[Desktop Entry]
Name=Dynamic Windows Test
Exec=@prefix@/bin/dwtest 
Terminal=false
MultipleArgs=false
Type=Application
Categories=Application;Development;X-Red-Hat-Base;