[RFC] Multi-language firmware (second try) (#941)

* Impl. sectioned font table in firmware

* make_translation.py: Extract build_symbol_conversion_table function

* Put translation indices and strings in a struct

* Move translation objcopy step to Python

* Impl. multi-language firmware demo

* Impl. strings-compressed multi-lang firmware demo

* Add font compression to multi-lang demo

* Refactor Makefile a bit

* Fix rules for make < 4.3

* Add more multi-lang groups

* Add Pinecil multi-lang CI build

* Add lzfx compression license text

* Remote multi-language demo group

* Fix build after merge

* Import code from BriefLZ

* Change brieflz for our use case

* Change compression to use brieflz

* Remove lzfx code

* Update license file for brieflz

* Exclude brieflz files from format check

* Add BriefLZ test

Translations/brieflz_test.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+import brieflz
+import unittest
+
+
+TEST_DATA = (
+    b"Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
+    b"Ut consequat mattis orci ac laoreet. Duis ac turpis tempus, varius lacus non, dignissim lectus. "
+    b"Curabitur quis metus luctus, sollicitudin ipsum at, dictum metus. "
+    b"Cras sed est nec ex tempor tincidunt in at ante. Vivamus laoreet urna eget lectus euismod feugiat. "
+    b"Duis a massa ac metus pellentesque interdum. Nunc congue, est faucibus convallis commodo, justo nibh sagittis augue, sed tristique urna neque vitae urna. "
+    b"Donec quis orci et purus imperdiet sollicitudin."
+)
+
+
+class TestBriefLZ(unittest.TestCase):
+    def test_roundtrip(self):
+        packed = brieflz.compress(TEST_DATA)
+        depacked = brieflz.depack_srcsize(packed, len(TEST_DATA))
+        self.assertEqual(depacked, TEST_DATA)
+
+
+if __name__ == "__main__":
+    unittest.main()