Add helper functions and docstrings to ascii.zig

* Add an upper case variant of `allocLowerString`
  * Add case-sensitive variants of `eqlIgnoreCase`, `indexOfIgnoreCase`,
    and `indexOfIgnoreCasePos`
  * Add and update docstrings on functions
9f496c0777Greg Anders committed on 5/12/2020, 1:36:41 AMparent7456389
1 file changedLine totals unavailable