[2/2] ntdll: rtlstr.c: Implement checking for control characters in RtlIsTextUnicode [try 8]

[Zac Brown]

Add checking for control characters in both standard and byte-reversed forms to 
(Rtl)IsTextUnicode.

Changelog:
* Add helper function that is similar to strnpbrkW except that it ensures the 
function stops after checking a given length.
* Ensures that we're only checking the first 'n' characters in the string, the 
way Windows does it.
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