XER support

libasn1compiler/asn1c_C.c

skeletons/ANY.c

skeletons/BIT_STRING.c

skeletons/BMPString.c

skeletons/BOOLEAN.c

skeletons/ENUMERATED.c

skeletons/GeneralString.c

skeletons/GeneralizedTime.c

skeletons/GraphicString.c

skeletons/IA5String.c

skeletons/INTEGER.c

skeletons/ISO646String.c

skeletons/NULL.c

skeletons/NativeEnumerated.c

skeletons/NativeInteger.c

skeletons/NativeReal.c

skeletons/NumericString.c

skeletons/OBJECT_IDENTIFIER.c

skeletons/OCTET_STRING.c

skeletons/OCTET_STRING.h