Add wrapOnWordBoundary option for consistently readable word wrapping

[speedytwenty]

This is in response to #125:

The current wordWrap functionality wraps only on space characters and truncates overhanging text.

Current wordWrap:

const table = new Table({
  head: ['1234', '1234'],
  colWidths: [4, 4],
  wordWrap: true,
});
table.push(['one', 'The Quick']);
table.push(['two', 'Brown Fox']);
table.push(['three', 'Jumped Over']);
table.push(['four', 'A Lazy']);
table.push(['five', 'Dog']);
console.log(table.toString());

Outputs.. not very useful anything:

┌────┬────┐
│ 1… │ 1… │
├────┼────┤
│ o… │ T… │
│    │ Q… │
├────┼────┤
│ t… │ B… │
│    │ F… │
├────┼────┤
│ t… │ J… │
│    │ O… │
├────┼────┤
│ f… │ A  │
│    │ L… │
├────┼────┤
│ f… │ D… │
└────┴────┘

---

Proposed feature: "wrapWords" Table Option

The "wrapWords" option produces an alternative word wrapping that truly wraps without truncating words.

const table = new Table({
  head: ['1234', '1234'],
  colWidths: [4, 4], // no word wrap without fixed width AFAIK
  wordWrap: true,
  wrapOnWordBoundary: false, // <- NEW
});
table.push(
  ['one', 'The Quick'],
  ['two', 'Brown Fox'],
  ['three', 'Jumped Over'],
  ['four', 'A Lazy'],
  ['five', 'Dog'],
);
console.log(table.toString());

Outputs

┌────┬────┐
│ 12 │ 12 │
│ 34 │ 34 │
├────┼────┤
│ on │ Th │
│ e  │ e  │
│    │ Qu │
│    │ ic │
│    │ k  │
├────┼────┤
│ tw │ Br │
│ o  │ ow │
│    │ n  │
│    │ Fo │
│    │ x  │
├────┼────┤
│ th │ Ju │
│ re │ mp │
│ e  │ ed │
│    │  O │
│    │ ve │
│    │ r  │
├────┼────┤
│ fo │ A  │
│ ur │ La │
│    │ zy │
├────┼────┤
│ fi │ Do │
│ ve │ g  │
└────┴────┘

---

It would be awesome to set wordWrap and wrapOnWordBoundary at the cell level level, but this global addition as-is provides a useful new option without introducing compatibility issues or needed redundant unit tests.

[speedytwenty]

Alright, I revamped this to clarify the interface and added tests that generate into docs for the new wrapOnWordBoundaryOption.

Usage (with existing wordWrap option):

const table = new Table({
  colWidths: [3, 3],
  wordWrap: true,
  wrapOnWordBoundary: false, // <-- NEW
});
table.push(['Wrap', 'Text']);
console.log(table.toString());

Outputs:

┌───┬───┐
│ W │ T │
│ r │ e │
│ a │ x │
│ p │ t │
└───┴───┘

Noticing "wrap" is a popular search on this repository, I also added an anchor-link in the readme to the word wrap options and improved the tests/docs for the wordWrap option as well.

No unit tests were added for Cell but it gets tested in the example tests. Cell passes on the wrapOnWordBoundary table option, defaulting to true—so as not to incur a "breaking change" to the API.