Get rid of a couple of copies of the CC0 text. Add header comment to
CC0 files to remind people editing them what the terms are. Also add
some missing XML headers. The header comments in layouts won't bloat
the binary - they get stripped out before compressing, same as any other
comments.
* new SOFTWARE LIST entries
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gameking.xml : mc_4szlh - 4 in 1 - S.Z.L.H + Colo + F1-2004 + Popper [Team Europe]
gamekin3.xml : panzer - Panzer [Team Europe]
redumped gameking mc_4v08 [Team Europe]
confirmed parent set of gameking Dino Adventure Legend was just a bad dump of the good one and removed it [Team Europe]
confirmed that many of the gameking 4-in-1 dumps are half size, and marked them as such [Team Europe, David Haywood]
changed tag from supported="no" to supported="partial" on the game king dumps that aren't bad dumps, as they appear to be playable without sound.
* style more consistent with c sources (nw)
* useful reference (nw)
