License headers: use SPDX-FileCopyrightText in all sources

tools/utils_ide/qtcreator/externaltools/qtc_expand_tabmix.py

@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2023 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
+
 import sys
 
 # TODO, get from QtCreator

tools/utils_ide/qtcreator/externaltools/qtc_sort_paths.py

@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2023 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
+
 import sys
 
 txt = sys.stdin.read()

tools/utils_ide/qtcreator/externaltools/qtc_toggle_if0.py

@@ -1,5 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2023 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
+
 import sys
 
 txt = sys.stdin.read()