fix/improve wii building
sdl is not a portlib, contains wii specific bits
use liblcf as portlib
support parallel compiling
small improvements in wii makefile
TOPDIR simplifies folder logic
'make echoconf' shows expected folder structure
'make addr2line' translates adresses from stack dump to source code
Merge pull request #199 from carstene1ns/master

improve compiling for wii target