Hello. The included patch adds org-babel support for haxe (https://haxe.org/).
It allows main class and function definitions to be optional, accepts
variables and supports babel functional mode. Please review.

I believe the same approach should work for java also. If this is fine I
could try to write an ob-java based on this to give java the same features
listed above.

One thing I would like to change is that this dumps the generated source
files in the current directory instead of burying them in the babel temp
dir (org-babel-temporary-directory). The same applies to the current
ob-java implementation. In order to put the temp source files in the babel
temp dir, there would have to be changes made in ob-core to allow creation
and removal of directories in the babel temp dir. If that seems reasonable
then I could try doing it, but let me know if there are reasons not to or
complications that I haven't thought of.

I've not done the FSF release. If this is acceptable I understand that I'll
have to do that.

-Ian