"Unbracketed AI" (caret) options for specifying GS1 input
(ticket #350, props Mario Verbruggen)
DBAR_EXP_CC/DBAR_EXPSTK_CC: fix separator over finder patterns
when linear part is greater than 4 codeblocks
general: left-over raw_text -> content_segs in comments;
update & expand some GS1 General Specs refs;
some minor code fiddling
test suite: suppress some additional ZINT_SANITIZEM false positives
(& add new ZINT_TESTUTIL_SANITIZEM_INIT helpers)
`BARCODE_CONTENT_SEGS`, `z_rt_XXX()` -> `z_ct_XXX()`;
move `encoded_data`/`row_height` to end of `zint_symbol`
(see ZXing-C++ issue #883)
manual: update re `content_segs`; `my_symbol` -> `symbol`;
improve MicroPDF417 description
