Use continue <N> in case statements to fix ErrorException with PHP 7.3.

```
Fatal error: Uncaught ErrorException: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?
```

library/Icinga/Application/Modules/Module.php

@@ -686,7 +686,7 @@ class Module
                         case 'depends':
                             if (strpos($val, ' ') === false) {
                                 $metadata->depends[$val] = true;
-                                continue;
+                                continue 2;
                             }
 
                             $parts = preg_split('/,\s+/', $val);

library/Icinga/File/Ini/IniParser.php

@@ -64,7 +64,7 @@ class IniParser
             switch ($state) {
                 case self::LINE_START:
                     if (ctype_space($s)) {
-                        continue;
+                        continue 2;
                     }
                     switch ($s) {
                         case '[':
@@ -130,7 +130,7 @@ class IniParser
 
                 case self::DIRECTIVE_VALUE_START:
                     if (ctype_space($s)) {
-                        continue;
+                        continue 2;
                     } elseif ($s === '"') {
                         $state = self::DIRECTIVE_VALUE_QUOTED;
                     } else {