Move Ghidra scripts from Jython to PyGhidra

[0x0ade]

Fedora doesn't even ship Python 2 packages anymore, which pushed me to the edge to figure out what's going wrong with PyGhidra, and from my testing:

• jpype picked the wrong overload on toAddr, so I simply wrapped it in a func that always explicitly casts to JLong first.
• FunctionDB.updateFunction was choking because jpype failed to turn Python lists into something that implements the Java List interface. Dunno if it's even meant to do that out of the box. Explicitly using ArrayList solves this.