Several Air related improvements

- Set cancel button to AIR Properties Dialog.
- Added "any" aspect ratio support.
- Added requested display resolution for desktop Mac hiDPI applications.
- Reworked the Android and iOS panels.
- Allow extensions to be added from *.ane files. Also, doing it this way will add the ANE as an external library to the project.
- Changed mobile simulation behaviour, so if the simulator is launched with no problems the command window is automatically closed.

New strings are hardcoded, hope this won't be a problem and some other developer or translator will have the time to spend on such task... if not, submit an issue and could do it myself later on, but I cannot give any ETA, I think the improvements are worth enough to ignore the problems.