Expose file extension regex to config

include/config.h

@@ -242,6 +242,10 @@ enum ProjectIdentifier {
     regex_sign_facing_directions,
     regex_trainer_types,
     regex_music,
+    regex_gbapal,
+    regex_bpp,
+    pals_output_extension,
+    tiles_output_extension,
 };
 
 enum ProjectFilePath {

include/project.h

@@ -258,6 +258,9 @@ private:
     QMap<QString, QString> facingDirections;
     QMap<QString, QString> speciesToIconPath;
 
+    const QRegularExpression re_gbapalExtension;
+    const QRegularExpression re_bppExtension;
+
     struct EventGraphics
     {
         QString filepath;