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

includes/html/graphs/graph.inc.php

@@ -81,7 +81,7 @@ if ($error_msg) {
         Rrd::graph($graphfile, $rrd_options);
         d_echo($rrd_cmd);
         if (is_file($graphfile)) {
-            if (! $debug) {
+            if (! \LibreNMS\Util\Debug::isEnabled()) {
                 set_image_type();
                 if ($output === 'base64') {
                     $imagedata = file_get_contents($graphfile);

includes/html/graphs/macaccounting/auth.inc.php

@@ -3,7 +3,7 @@
 if (is_numeric($vars['id'])) {
     $acc = dbFetchRow('SELECT * FROM `mac_accounting` AS M, `ports` AS I, `devices` AS D WHERE M.ma_id = ? AND I.port_id = M.port_id AND I.device_id = D.device_id', [$vars['id']]);
 
-    if ($debug) {
+    if (\LibreNMS\Util\Debug::isEnabled()) {
         echo '<pre>';
         print_r($acc);
         echo '</pre>';