Allow packing to ZIP files

tests/test_pack_zipped.py

@@ -0,0 +1,18 @@
+import zipfile
+from test_pack import AbstractPackTest
+
+from blender_asset_tracer.pack import zipped
+
+
+class ZippedPackTest(AbstractPackTest):
+    def test_basic_file(self):
+        infile = self.blendfiles / 'basic_file_ñønæščii.blend'
+        zippath = self.tpath / 'target.zip'
+        with zipped.ZipPacker(infile, infile.parent, zippath) as packer:
+            packer.strategise()
+            packer.execute()
+
+        self.assertTrue(zippath.exists())
+        with zipfile.ZipFile(str(zippath)) as inzip:
+            inzip.testzip()
+            self.assertEqual({'pack-info.txt', 'basic_file_ñønæščii.blend'}, set(inzip.namelist()))