Allow any stringifiable object in table values

[DenverCoder1]

Allow table2ascii to convert objects such as numbers to strings when building table

text = t2a(
    header=[1, "G", "H", "R", "S"],
    body=[[1, 2, 3, 4, 5]],
    first_col_heading=True,
)

Error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/jonah/.local/lib/python3.9/site-packages/table2ascii/table_to_ascii.py", line 309, in table2ascii
  File "/home/jonah/.local/lib/python3.9/site-packages/table2ascii/table_to_ascii.py", line 44, in __init__
  File "/home/jonah/.local/lib/python3.9/site-packages/table2ascii/table_to_ascii.py", line 102, in __auto_column_widths
  File "/home/jonah/.local/lib/python3.9/site-packages/table2ascii/table_to_ascii.py", line 98, in <lambda>
TypeError: object of type 'int' has no len()

        for i in range(self.__columns):
            # number of characters in column of i of header, each body row, and footer
>           header_size = len(self.__header[i]) if self.__header else 0
E           TypeError: object of type 'int' has no len()