Dreamcast fix-up for latest KOS with SD-Card support
update to make SD building and exporting cleaner
Texture and Image handling cleanup with better extension checking, added extension conversion MapString subclass to prepare for loading LWO models on DC (e.g. automated PNG->PCX renaming during load)
Update to add back optional support for DCDevR4 builds (old maple driver), example projects build with 'make rc4'
fixed up sd card build in Makefiles
Cleanup of various compiler warnings and possible issues
DC project cleanup, stringutil patch for lock-up, newer broadphase for bullet, addition of kglx sources for simpler DC builds + customization
clean up object files
New wavefront OBJ loader + dreamcast model example
fixed issue with doubling-up of dynamic lighting vertex buffers for SceneObjects
merge dreamcast-experimental, add fastlz compression to datatree