feat(test) first experiement with Unity test engine

tests/main.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+import defines
+import build
+import test
+
+
+files = test.prepare()
+
+for f in files:
+  name = f[:-2] #test_foo.c -> test_foo 
+  build.build("Minimal config, 16 bit color depth", defines.minimal_16bit, name)
+  
+
+#build("Minimal config monochrome", minimal_monochrome)
+#build.build("Minimal config, 16 bit color depth", defines.minimal_16bit, "test_obj_tree")
+#build("Minimal config, 16 bit color depth swapped", minimal_16bit_swap)
+#build("Full config, 32 bit color depth", full_32bit)