#5 Tile size is specified in server config.

[Levi Aho]

The editor uses the tile size specified in the server
config. Even if it is incorrect! Realisticly, level
files should store this information internally, but at
the moment, they don't. It could infer the size from
the tileset, but that is really a hack and dosn't allow
for proper error checking.

In fact, the tile size config variable should be
eliminated altogether. The server and editor should
both use a value obtained directly from the level
itself. On the other tentacle, this could lead to
situations where the server is told to load several
levels with inconsistant tile sizes.