Support fillEqually

The default distribution is fillProportionally.

print(table: ["Good", "Very Good", "Happy", "Cool!"], header: ["Wed", "Thu", "Fri", "Sat"])

+----+---------+-----+-----+
|Wed |Thu      |Fri  |Sat  |
+----+---------+-----+-----+
|Good|Very Good|Happy|Cool!|
+----+---------+-----+-----+

But It can be set by fillEqually like below

print(table: ["Good", "Very Good", "Happy", "Cool!"], header: ["Wed", "Thu", "Fri", "Sat"], distribution: .fillEqually)

+---------+---------+---------+---------+
|Wed      |Thu      |Fri      |Sat      |
+---------+---------+---------+---------+
|Good     |Very Good|Happy    |Cool!    |
+---------+---------+---------+---------+