BMPString and UniversalString support

asn1c/tests/data-119/data-119-18.in

asn1c/tests/data-119/data-119-19.in

asn1c/tests/data-119/data-119-20-P.in

asn1c/tests/data-119/data-119-21-P.in

asn1c/tests/data-119/data-119-22-P.in

asn1c/tests/data-119/data-119-23-P.in

asn1c/tests/data-119/data-119-24-P.in

asn1c/tests/data-119/data-119-25-P.in

libasn1compiler/asn1c_C.c

libasn1compiler/asn1c_constraint.c

libasn1fix/asn1fix_constraint_compat.c

skeletons/ANY.c

skeletons/BIT_STRING.c

skeletons/BMPString.c

skeletons/OCTET_STRING.c

skeletons/OCTET_STRING.h

skeletons/UniversalString.c

tests/119-per-strings-OK.asn1

tests/119-per-strings-OK.asn1.-EF

tests/119-per-strings-OK.asn1.-Pgen-PER