Make $_REQUEST processing independent of sub-calls

- Move HTTPInputData::process() into App::runFrontend()
- Pass $_REQUEST (including processed Input) to every Module method
- Delete $_POST parameters at Module post() calls because of $_REQUEST

src/Module/OAuth/Token.php

@@ -34,7 +34,7 @@ use Friendica\Security\OAuth;
  */
 class Token extends BaseApi
 {
-	protected function post(array $request = [], array $post = [])
+	protected function post(array $request = [])
 	{
 		$request = $this->getRequest([
 			'client_id'     => '', // Client ID, obtained during app registration