iOS: Switch to using UIApplicationMain() in dw_main(). This is not a long term solution since it never exits and has some other limitations, but apparently it does some setup we were not doing. We are now getting auto constraint errors due to conflicts with the DW layout engine. Some changes to avoid these but still getting them... so more work needed.

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