STRING max size and length type can now be overloaded (define STR_MAX_LEN and STR_LEN_TYPE before including iec_types.h)

STD_TEST.st
STD_RESSOURCE.c
LOCATED_VARIABLES.h
POUS.c
test
STD_CONF.c
SFC_TEST.st
test.exe
plc.st
POUS.h
VARIABLES.csv