Changed name of the addon to Unreal PSK/PSA (.psk/.psa) (short and sweet)

Also added missing `files` permission

io_scene_psk_psa/blender_manifest.toml

@@ -1,7 +1,7 @@
 schema_version = "1.0.0"
 id = "io_scene_psk_psa"
 version = "7.1.0"
-name = "Unreal Mesh & Animation (.psk/.psa)"
+name = "Unreal PSK/PSA (.psk/.psa)"
 tagline = "Import and export PSK and PSA files used in Unreal Engine"
 maintainer = "Colin Basnett <cmbasnett@gmail.com>"
 type = "add-on"
@@ -22,3 +22,6 @@ paths_exclude_pattern = [
   "/.github/",
   ".gitignore",
 ]
+
+[permissions]
+files = "Import/export PSK and PSA files from/to disk"