[Lua] Adds some useful encoding APIs for Lua (base64 encoding and decoding and such).

lib/space_lua/stdlib/encoding_test.lua

@@ -0,0 +1,9 @@
+local function assertEqual(a, b)
+    if a ~= b then
+        error("Assertion failed: " .. a .. " is not equal to " .. b)
+    end
+end
+
+
+assertEqual(encoding.utf8Decode(encoding.utf8Encode("test")), "test")
+assertEqual(encoding.utf8Decode(encoding.base64Decode(encoding.base64Encode("test"))), "test")