fix various typos in the web documentation

add functions to insert elements into lists/arrays without duplicates - resolves #557

assert instead of assume sorted property in debug builds

replace all remaining generics with cx_strcast() - resolves #700

add unsigned char strings to cx_strcast() and changes documentation

go back to ctype.h, but this time try to avoid crashes in Microsoft's implementation

missing custom CFLAGS when testing for memrchr availability

improve feature test for memrchr() making it also available on BSD

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