New themes with FontAwesome don't include FontAwesome

[jbalsas]

Creating a new theme with FontAwesome fails to import the font.

Test 1:

• When generating a new theme for 7.2
• Given you answer Y to the question about including FontAwesome
• Then:
  • ✅ "fontAwesome": true in the package.json of the created theme
  • ❌ Some code like @import 'liferay-font-awesome/scss/font-awesome' in _custom.scss

Test 2:

• When you run gulp build on the generated theme
• Then:
  • ✅ The build folder contains a font folder with the icon fonts which is packaged in the war artifact

Test 3:

• When you run gulp deploy on the generated theme
• Then:
  • ❌ You can see fontawesome and glyphicons icons in portal

[jbalsas]

Should be fixed in #379