CMake build infrastructure II (#53)

* CMake build infrastructure

The squashed commit that builds and packages releases for the SIMH
simulator suite with CMake, version 3.14 or newer.

See README-CMake.md for documentation.

cmake/simgen/utils.py

@@ -0,0 +1,9 @@
+import re
+
+
+def emit_debug(dval, level, msg):
+    if dval >= level:
+        print(msg)
+
+def do_debug(dval, level, act):
+    pass