tests: Add spiced up wrapping tests

* Generate random string that looks like a sentence.
* Measure the size at 100 random widths.
* assert that for those widths, when sorted, the measured widths
  are increasing and the heights are decreasing.

* Generate random string that looks like a sentence.
* Generate a 2nd string adding hyphen + newline after every char of
  original string.
* Assert that wrap-char wrap with width=0 is not larger than the width
  of the 2nd string

The tests also generate random strings in LTR, RTL or both at the same
time to spice the test up even more.
It does that by picking random words out of hunspell directories, and if
none are installed, it falls back to lorem ipsum.

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