Panic on non-fatal errors

[jm33-m0]

For example:

tablewriter/table_with_color.go

Lines 115 to 122 in df64c4b

	func (t *Table) SetColumnColor(colors ...Colors) {
	if t.colSize != len(colors) {
	panic("Number of column colors must be equal to number of headers.")
	}
	for i := 0; i < len(colors); i++ {
	t.columnsParams = append(t.columnsParams, makeSequence(colors[i]))
	}
	}

Just because the table writer can't print a table doesn't mean we have to kill the whole program. I suggest changing all panics to logging, if needed I will open a pull request.

Thanks!

[jm33-m0]

Instead of killing the whole process, we should just print a warning telling the user what is wrong, so the user will see the error rather than a table.