My fix for the unchecked warning in AppleImage.java was completely dumb
and I had no idea what I was doing. My understanding of how this works
is now greatly improved and the bug I introduced in 292afd2 is fixed.
Fixed all instances of warnings OpenJDK finds with -Xlint:unchecked.
Merging this will at least result in a dependency on JDK 1.5 or later
that I'm pretty sure of. But since the only JDKs that are really safe
to use these days are versions 1.8 and 9, that's probably okay.
No promises that this will make modern SWT work or anything, but it's
probably at least a beginnig toward that as well.
