Concept: HashLink to use Haxe as a modding platform

• Use Haxe as a language for modding; similar to Java and C# which modders are already familiar with.
• HashLink runs pretty fast.
• Looks like we can load and unload modules through the API and make calls in to them

TODO Can we load multiple separate compiled projects in the same engine?

TODO Do we call in to these modules each frame to do mod stuff?

• HashLink header on Github