Some refactoring needed?

[Lapayo]

- Too many small files. Makes compilation take (quite a lot) longer.
- Using "char" instead of "NIBBLETYPE" for metas. currently, metas are handled as unsigned chars.
- Not using "override" for overridden virtual functions. Please, get used to this one, it's a really good practice to mark overridden functions, the compiler then checks if the function is really overriding something, and thus can catch some nasty typo bugs.

I´ll try to stick to the last 2 proposals.

But about those many small files:
I have no idea how to speed them up. Putting them all back in one file wouldn´t be a solution, because it would mess everything up again.