Allow subdirectories for composers

[squareone-jarrod]

I wanted to be able to categorise my ACF Blocks into subdirectories to make them more manageable. Though I soon learned that I couldn't do this due to the way that the fully qualified class name gets resolved from the composer path.

For instance, my blocks directory looks like this:

Blocks
  - Typography
      - Heading.php
      - Text.php
  - WooCommerce
      - Products.php

But when trying to figure out the FQ class name, it arrives at: MyTheme\Content\Heading (omitting the Blocks directory). I've created a PR that correctly picks up the FQ class name.

[Log1x]

Should be resolved with #104