Support older Mac versions

[shannah]

Right now the Mac versions are 10.14+ (Mojave). This is because of Azul. If we used AdoptOpenJDK, we could support 10.10+. Down-side of AdoptOpenJDK is that they don't have a JRE+FX or JDK+FX option.

Also would be nice to provide support for even older Macs. E.g. The first non-Apple JDK to run on OS X was JDK7 and it supported Lion (10.7+). It would be nice to see how far back we can push that.

And then even further to older Macs with Apple JDK (1.5/1.6).