expose current `GhidraScript` instance to Python

[slippycheeze]

ghidra.util.Msg has some useful "popup" functions that I wanted to use, specifically the ones that take a Java Throwable for displaying Java exception details; for example:

public static void showError​(java.lang.Object originator, java.awt.Component parent, java.lang.String title, java.lang.Object message)

That first argument, originator, is supposed to be the Java thing that is displaying the message; typical use would be Msg.showError(this, ...) in Java. I'd like to do the same in Ghidrathon, but there is no easy way I can see to access the current GhidraScript derivative.

I can get the current script by calling jepwrappers.get_script(), which returns the ghidrathon.GhidrathonScript instance, if I want, but it isn't exposed any other way that I can see.

I'd suggest adding getCurrentScript() or something very similar as a "public" version of that to the globals of the python script environment?

[mike-hunhoff]

@slippycheeze thank you for the suggestion. I like the idea of adding a new Python function, named getCurrentScript, to the Python builtins scope. Alternatively, we should consider naming the function script to better align with the way Ghidrathon exposes other GhidraScript variables like currentProgram and monitor.

[slippycheeze]

ultimately, anything that provided a "public" API to getting the GhidraScript instance would be fine by me; I don't have strong feelings about what it is called or anything like that. thanks. :)