Remove debug globals (#12811)

* Remove $debug global
and $vdebug global
makes these variables more accessible and protects from collisions.

* the on boot set sends application as the first parameter, just handle that

* Relocate other debug related functions

* Log debug to stdout

* Wrong output

* remove stupid constants

* Fix lint and style issues

poll-billing.php

@@ -12,6 +12,7 @@
  */
 
 use LibreNMS\Data\Store\Datastore;
+use LibreNMS\Util\Debug;
 
 $init_modules = [];
 require __DIR__ . '/includes/init.php';
@@ -23,7 +24,7 @@ if (isset($argv[1]) && is_numeric($argv[1])) {
     $options = getopt('db:');
 }
 
-set_debug(isset($options['d']));
+Debug::set(isset($options['d']));
 Datastore::init();
 
 // Wait for schema update, as running during update can break update