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
The call to decRefCount has been moved to the destructor
of the base class BaseString.
Note that BaseString only exists for the purpose of being able
to reuse code for our String and U32String implementations. As
such it is not meant to be used polymorphically and its
destructor does not need to be virtual (with the overhead that
this generates). And to ensure that it is not used in a
polymorphic way, the destructor is declared protected.
