Commits on May 25, 2023

1. Fix many calls to ctype functions …

   All ctype functions like `isspace()`, `tolower()` and alike expect a
   character as an `unsigned char` or EOF, anything else has undefined
   behavior.
   
   This commit should fix all calls to the various ctype functions either:
   
   * adding `unsigned char` cast where appropriate;
   * removing useless `int` casts that are more confusing than useful.
   
   Some instances required slightly more involved changes though, but the
   fix itself is the same.
   
   To find the calls to check, I used an equivalent to the following:
   
   ```
   git grep -P 'is(alnum|alpha|cntrl|x?digit|graph|lower|print|punct|'\
   'space|upper|ascii|blank)|to(low|up)er'
   ```
   
   ...and then proceeded to manually check each one of them to see if the
   call, or call chain, was using appropriate values and types.

   

   b4n committed May 25, 2023
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