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

html/network-map.php

@@ -9,6 +9,7 @@
  */
 
 use LibreNMS\Config;
+use LibreNMS\Util\Debug;
 
 $links = 1;
 
@@ -21,7 +22,7 @@ if (! Auth::check()) {
 
 $options = getopt('d::');
 
-if (set_debug(isset($options['d']))) {
+if (Debug::set(isset($options['d']), false)) {
     echo "DEBUG!\n";
 }