fix: accept -p and -t in every tool

verify, generate_pack and cross_reference took -p and -t, slots, generate_truth, diff_truth, export_native and refresh_data_dirs refused them. A test reads every add_argument call.

scripts/slots.py

@@ -897,7 +897,7 @@ def main() -> int:
         "the file a platform baseline would ship.",
     )
     parser.add_argument(
-        "--platform", type=platform_arg,
+        "--platform", "-p", type=platform_arg,
         help="one platform instead of all",
     )
     parser.add_argument(
@@ -918,7 +918,7 @@ def main() -> int:
         help="with all platforms, the archived ones too (RetroPie)",
     )
     parser.add_argument(
-        "--target", help="judge only the cores a hardware target builds",
+        "--target", "-t", help="judge only the cores a hardware target builds",
     )
     parser.add_argument(
         "--strict",