Support showing licenses in About page

[Goooler]

We can use Licensee to generate a dependency report and show it in About page.

[chrisbanes]

PRs welcome here! Licensee will generate the JSON file, but off the top of my head we'll need:

• Gradle task to copy the JSON file into the generated resources folder
• JSON parsing of the file
• UI to display
• Make it work across the different variants (and platforms)

[penkzhou]

I just create a pr for the issue.
#1528