RomRaider

When I first took the current XML form from openecu, it had an <include> tag that would be used to import the base definitions of an ECU to make adding new ones a bit easier (simply adding the memory addresses, basically). This will also make modifying definitions a whole lot easier, as most of the time you'll only have to change the one tag rather than every instance.

I'd decided it would be best to drop includes, but after some research, I've decided to go ahead and implement it afterall. This should be available in the next release of RomRaider, which I hope I'll be able to finish some time next week, but I might be working overtime and not have a chance to get to it.

Just a heads up, as it may help with creating more ECU definitions.