Make package autoloadable about wp-less HOT 2 CLOSED

Update: My initial idea was to simply put bootstrap-for-theme.php into composer's autoload section. Whereas this would work for a theme that bundles the plugin and is published to wordpress.org, it will break any other use of the package as the bootstrap file depends on WordPress functionality. I keep digging.

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More insights: The issue arises because of the nature of the current static class creation method: WPPluginToolkitPlugin::create('WPLess', __FILE__, 'WPLessPlugin'); - it depends on knowing the path to the plugin. This is perfectly fine for many cases, but will break the workflow if you are using a boilerplate like Bedrock when the package will end up in some vendor directory the including theme doesn't know about.

I created a simple wrapper class removing the dependency on the path. Let's discuss in the PR #103

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