Filter out fields that is not available on selected platform.

[aaulia]

I have to work with TextField a lot recently, and got surprised a few times, since some fields like "restrict" and "getTextFormat()" is only available in flash but not on other platforms (windows/linux/android and other cpp too I guess). I think it would be very helpful if MD filter out this platform specific fields (I believe they were surrounded by conditional compilation, should this HaXe responsibility in providing the correct completion list)?

[atomicptr]

This refers to #10