Force-wrap long Strings

[meowgorithm]

This update forces strings that run wider than the given width to wrap as a sensible default.

So, given the following code:

s := lipgloss.NewStyle().
    BorderStyle(lipgloss.RoundedBorder()).
    Width(5).
    Render("Schnurrbart")

fmt.Println(s)

Prior to this update it would render as such:

╭─────╮
│Schnurrbart│
╰─────╯

After this update is renders as follows:

╭─────╮
│Schnu│
│rrbar│
│t    │
╰─────╯

We could potentially introduce a setting to disallow this behavior, however we'll examine that use when the need arises. Special thanks to @erikgeiser for the upstream PR that made this a cinch.

Closes #43.