Fix some corner cases in the recognition of C++ raw strings.
These are where changing the identifier in a raw string delimiter causes different delimiters to match eachother. * lisp/progmodes/cc-engine.el (c-raw-string-end-delim-disrupted): New variable. (c-before-change-check-raw-strings): Use new variable. (c-after-change-unmark-raw-strings): When typing into an opening delimiter or altering its close delimiter causes the opening delimiter to match a later closing delimiter, clear all syntax-table char properties from the opening delimiter onwards, and set c-new-END to point max. Also, when changing a closing delimiter, check whether its new value matches a previously open opening delimiter earlier in the buffer, and amend the syntax-table text properties appropriately.
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