Code quality: Fix header guards consistency

Adds `header_guards.sh` bash script, used in CI to validate future
changes. Can be run locally to fix invalid header guards.

modules/openxr/action_map/openxr_action.h

@@ -84,4 +84,4 @@ public:
 
 VARIANT_ENUM_CAST(OpenXRAction::ActionType);
 
-#endif // !OPENXR_ACTION_H
+#endif // OPENXR_ACTION_H

modules/openxr/action_map/openxr_action_map.h

@@ -28,8 +28,8 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#ifndef OPENXR_ACTION_SETS_H
-#define OPENXR_ACTION_SETS_H
+#ifndef OPENXR_ACTION_MAP_H
+#define OPENXR_ACTION_MAP_H
 
 #include "core/io/resource.h"
 
@@ -79,4 +79,4 @@ public:
 	~OpenXRActionMap();
 };
 
-#endif // !OPENXR_ACTION_SETS_H
+#endif // OPENXR_ACTION_MAP_H

modules/openxr/action_map/openxr_action_set.h

@@ -72,4 +72,4 @@ public:
 	~OpenXRActionSet();
 };
 
-#endif // !OPENXR_ACTION_SET_H
+#endif // OPENXR_ACTION_SET_H

modules/openxr/action_map/openxr_defs.h

@@ -121,4 +121,4 @@ public:
 	static PackedStringArray get_interaction_profile_paths();
 };
 
-#endif // !OPENXR_DEFS_H
+#endif // OPENXR_DEFS_H

modules/openxr/action_map/openxr_interaction_profile.h

@@ -98,4 +98,4 @@ public:
 	~OpenXRInteractionProfile();
 };
 
-#endif // !OPENXR_INTERACTION_PROFILE_H
+#endif // OPENXR_INTERACTION_PROFILE_H