Move files relative to export code to subdir exporters.
Code cleanup: Pcbnew: move files relative to exort functions to the new folder exporters
all: remove include <protos.h>  from a lot of  files which do not need it.
Code cleanup: Pcbnew: move files relative to export functions to the new folder exporters
Pcbnew, Eeschema: remove include file <protos.h> from a lot of files which do not need it.