Change Mom to SlotMachine

rather large commit, but essentially a simple rename
Rationale in docs and blogs

test/slot_machine/macro/README.md

@@ -0,0 +1,10 @@
+# Builtin Testing
+
+At the Module level (word/object/integer) mostly testing that
+- functions exist
+- they compile
+- basic length tests (no "contents")
+
+Minimal tests for risc compilation, and again length only (should be array too)
+
+Functionality is tested by interpreter over in interpreter dir