Declare strict types in all src scripts

src/MDCurrenciesSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available currencies.

src/MDEventsSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available units for events.

src/MDLanguagesSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing static functions for getting available languages.

src/MDLicensesSet.php

@@ -4,11 +4,12 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing static functions for getting available licenses on md.
  */
-class MDLicensesSet {
+class MDLicensesSet extends MDValueSet {
 
     const AVAILABLE_LICENSES = [
 

src/MDMarkingTypesSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available marking types.

src/MDObjectPositionsSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available positions on an object.

src/MDPlacetypesSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available place types.

src/MDUnitsSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Class containing available units for weights, lengths etc.

src/MDValueSet.php

@@ -4,6 +4,7 @@
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
+declare(strict_types = 1);
 
 /**
  * Generic class for value sets.