Different platforms have different levels of support of encodings and
often have slight variations. We already have tables for most encoding
with only CJK missing. Full transcoding inclusion allows us to get reliable
encoding results independently of platform. The biggest con is the need for
external tables encoding.dat.
It removes a duplicate table for korean in graphics/korfont.cpp
This breaks compilation on several platforms due to the initialization
in the header. This is replaced by adding a constructor / destructor
instead as per the other class, which also will aid future development
of this code.
